Looks like the debug log catched an error:
08-Okt-2020 14:42:12.651 [DEBUG] [ab.binding.miio.internal.handler.MiIoVacuumHandler] - Periodic update for 'miio:vacuum:0F8F154D' (miio:vacuum)
08-Okt-2020 14:42:12.653 [DEBUG] [ing.miio.internal.transport.MiIoAsyncCommunication] - Command added to Queue {"id":563,"method":"get_dnd_timer","params":[]} -> 192.168.2.36 (Device: 0F8F154D token: 62673476XXXXXXXXXXXXXXXX544D4664 Queue: 1)
08-Okt-2020 14:42:12.654 [DEBUG] [ing.miio.internal.transport.MiIoAsyncCommunication] - Command added to Queue {"id":564,"method":"get_clean_summary","params":[]} -> 192.168.2.36 (Device: 0F8F154D token: 62673476XXXXXXXXXXXXXXXX544D4664 Queue: 2)
08-Okt-2020 14:42:12.654 [DEBUG] [ing.miio.internal.transport.MiIoAsyncCommunication] - Command added to Queue {"id":565,"method":"get_status","params":[]} -> 192.168.2.36 (Device: 0F8F154D token: 62673476XXXXXXXXXXXXXXXX544D4664 Queue: 3)
08-Okt-2020 14:42:12.667 [DEBUG] [ing.miio.internal.transport.MiIoAsyncCommunication] - Command added to Queue {"id":566,"method":"miIO.info","params":[]} -> 192.168.2.36 (Device: 0F8F154D token: 62673476XXXXXXXXXXXXXXXX544D4664 Queue: 3)
08-Okt-2020 14:42:12.668 [DEBUG] [ing.miio.internal.transport.MiIoAsyncCommunication] - Command added to Queue {"id":567,"method":"get_consumable","params":[]} -> 192.168.2.36 (Device: 0F8F154D token: 62673476XXXXXXXXXXXXXXXX544D4664 Queue: 4)
08-Okt-2020 14:42:12.668 [DEBUG] [ing.miio.internal.transport.MiIoAsyncCommunication] - Command added to Queue {"id":568,"method":"get_map_v1","params":[]} -> 192.168.2.36 (Device: 0F8F154D token: 62673476XXXXXXXXXXXXXXXX544D4664 Queue: 5)
08-Okt-2020 14:42:12.695 [DEBUG] [.binding.miio.internal.handler.MiIoAbstractHandler] - Received response for 0F8F154D type: DND_GET, result: [{"start_hour":20,"start_minute":0,"end_hour":6,"end_minute":0,"enabled":0}], fullresponse: {"result":[{"start_hour":20,"start_minute":0,"end_hour":6,"end_minute":0,"enabled":0}],"id":563}
08-Okt-2020 14:42:12.716 [DEBUG] [.binding.miio.internal.handler.MiIoAbstractHandler] - Received response for 0F8F154D type: CLEAN_SUMMARY_GET, result: [162141,2766180000,290,[1601359191,1601358827,1601358629,1600322825,1600322066,1600321862,1600321411,1600321119,1600320796,1600168750,1600168509,1600168239,1600168116,1600168009,1600167828,1599984519,1599982194,1599981986,1599981862,1599981694]], fullresponse: {"result":[162141,2766180000,290,[1601359191,1601358827,1601358629,1600322825,1600322066,1600321862,1600321411,1600321119,1600320796,1600168750,1600168509,1600168239,1600168116,1600168009,1600167828,1599984519,1599982194,1599981986,1599981862,1599981694]],"id":564}
08-Okt-2020 14:42:12.732 [DEBUG] [.binding.miio.internal.handler.MiIoAbstractHandler] - Received response for 0F8F154D type: GET_STATUS, result: [{"msg_ver":1,"msg_seq":1353,"state":8,"battery":100,"clean_time":637,"clean_area":13312500,"error_code":0,"map_present":1,"in_cleaning":0,"in_returning":0,"in_fresh_state":1,"lab_status":1,"fan_power":104,"dnd_enabled":0,"map_status":3,"lock_status":0}], fullresponse: {"result":[{"msg_ver":1,"msg_seq":1353,"state":8,"battery":100,"clean_time":637,"clean_area":13312500,"error_code":0,"map_present":1,"in_cleaning":0,"in_returning":0,"in_fresh_state":1,"lab_status":1,"fan_power":104,"dnd_enabled":0,"map_status":3,"lock_status":0}],"id":565}
08-Okt-2020 14:42:12.751 [DEBUG] [.binding.miio.internal.handler.MiIoAbstractHandler] - Received response for 0F8F154D type: MIIO_INFO, result: {"hw_ver":"Linux","fw_ver":"3.5.4_0948","ap":{"ssid":"ossipower","bssid":"C0:25:06:61:CF:45","rssi":-57},"netif":{"localIp":"192.168.2.36","mask":"255.255.255.0","gw":"192.168.2.1"},"model":"roborock.vacuum.m1s","mac":"50:EC:50:0E:5A:26","token":"62673476347a4334306a3674544d4664","life":39897}, fullresponse: {"partner_id":"","id":566,"code":0,"message":"ok","result":{"hw_ver":"Linux","fw_ver":"3.5.4_0948","ap":{"ssid":"ossipower","bssid":"C0:25:06:61:CF:45","rssi":-57},"netif":{"localIp":"192.168.2.36","mask":"255.255.255.0","gw":"192.168.2.1"},"model":"roborock.vacuum.m1s","mac":"50:EC:50:0E:5A:26","token":"62673476347a4334306a3674544d4664","life":39897}}
08-Okt-2020 14:42:12.766 [DEBUG] [.binding.miio.internal.handler.MiIoAbstractHandler] - Received response for 0F8F154D type: CONSUMABLES_GET, result: [{"main_brush_work_time":143348,"side_brush_work_time":143348,"filter_work_time":143348,"sensor_dirty_time":35552}], fullresponse: {"result":[{"main_brush_work_time":143348,"side_brush_work_time":143348,"filter_work_time":143348,"sensor_dirty_time":35552}],"id":567}
08-Okt-2020 14:42:12.806 [DEBUG] [.binding.miio.internal.handler.MiIoAbstractHandler] - Received response for 0F8F154D type: GET_MAP, result: ["ruby2%2F261035341%2F7"], fullresponse: {"result":["ruby2%2F261035341%2F7"],"id":568}
08-Okt-2020 14:42:12.811 [DEBUG] [openhab.binding.miio.internal.cloud.CloudConnector] - Getting vacuum map ruby2%2F261035341%2F7 from Xiaomi cloud server: 'cn'
08-Okt-2020 14:42:12.812 [DEBUG] [enhab.binding.miio.internal.cloud.MiCloudConnector] - Send request: {"obj_name":"ruby2%2F261035341%2F7"} to https://api.io.mi.com/app/home/getmapfileurl
08-Okt-2020 14:42:13.160 [DEBUG] [enhab.binding.miio.internal.cloud.MiCloudConnector] - Error while executing request to https://api.io.mi.com/app/home/getmapfileurl :org.eclipse.jetty.client.HttpResponseException: HTTP protocol violation: Authentication challenge without WWW-Authenticate header
08-Okt-2020 14:42:13.160 [DEBUG] [enhab.binding.miio.internal.cloud.MiCloudConnector] - Received message is invalid JSON:
08-Okt-2020 14:42:42.669 [DEBUG] [ab.binding.miio.internal.handler.MiIoVacuumHandler] - Periodic update for 'miio:vacuum:0F8F154D' (miio:vacuum)
08-Okt-2020 14:42:42.669 [DEBUG] [ing.miio.internal.transport.MiIoAsyncCommunication] - Command added to Queue {"id":569,"method":"get_dnd_timer","params":[]} -> 192.168.2.36 (Device: 0F8F154D token: 62673476XXXXXXXXXXXXXXXX544D4664 Queue: 1)
08-Okt-2020 14:42:42.675 [DEBUG] [ing.miio.internal.transport.MiIoAsyncCommunication] - Command added to Queue {"id":570,"method":"get_clean_summary","params":[]} -> 192.168.2.36 (Device: 0F8F154D token: 62673476XXXXXXXXXXXXXXXX544D4664 Queue: 2)
08-Okt-2020 14:42:42.676 [DEBUG] [ing.miio.internal.transport.MiIoAsyncCommunication] - Command added to Queue {"id":571,"method":"get_status","params":[]} -> 192.168.2.36 (Device: 0F8F154D token: 62673476XXXXXXXXXXXXXXXX544D4664 Queue: 3)
08-Okt-2020 14:42:42.677 [DEBUG] [ing.miio.internal.transport.MiIoAsyncCommunication] - Command added to Queue {"id":572,"method":"get_consumable","params":[]} -> 192.168.2.36 (Device: 0F8F154D token: 62673476XXXXXXXXXXXXXXXX544D4664 Queue: 4)
08-Okt-2020 14:42:42.677 [DEBUG] [ing.miio.internal.transport.MiIoAsyncCommunication] - Command added to Queue {"id":573,"method":"get_map_v1","params":[]} -> 192.168.2.36 (Device: 0F8F154D token: 62673476XXXXXXXXXXXXXXXX544D4664 Queue: 5)
08-Okt-2020 14:42:42.745 [DEBUG] [.binding.miio.internal.handler.MiIoAbstractHandler] - Received response for 0F8F154D type: DND_GET, result: [{"start_hour":20,"start_minute":0,"end_hour":6,"end_minute":0,"enabled":0}], fullresponse: {"result":[{"start_hour":20,"start_minute":0,"end_hour":6,"end_minute":0,"enabled":0}],"id":569}
08-Okt-2020 14:42:42.765 [DEBUG] [.binding.miio.internal.handler.MiIoAbstractHandler] - Received response for 0F8F154D type: CLEAN_SUMMARY_GET, result: [162141,2766180000,290,[1601359191,1601358827,1601358629,1600322825,1600322066,1600321862,1600321411,1600321119,1600320796,1600168750,1600168509,1600168239,1600168116,1600168009,1600167828,1599984519,1599982194,1599981986,1599981862,1599981694]], fullresponse: {"result":[162141,2766180000,290,[1601359191,1601358827,1601358629,1600322825,1600322066,1600321862,1600321411,1600321119,1600320796,1600168750,1600168509,1600168239,1600168116,1600168009,1600167828,1599984519,1599982194,1599981986,1599981862,1599981694]],"id":570}
08-Okt-2020 14:42:42.798 [DEBUG] [.binding.miio.internal.handler.MiIoAbstractHandler] - Received response for 0F8F154D type: GET_STATUS, result: [{"msg_ver":1,"msg_seq":1354,"state":8,"battery":100,"clean_time":637,"clean_area":13312500,"error_code":0,"map_present":1,"in_cleaning":0,"in_returning":0,"in_fresh_state":1,"lab_status":1,"fan_power":104,"dnd_enabled":0,"map_status":3,"lock_status":0}], fullresponse: {"result":[{"msg_ver":1,"msg_seq":1354,"state":8,"battery":100,"clean_time":637,"clean_area":13312500,"error_code":0,"map_present":1,"in_cleaning":0,"in_returning":0,"in_fresh_state":1,"lab_status":1,"fan_power":104,"dnd_enabled":0,"map_status":3,"lock_status":0}],"id":571}
08-Okt-2020 14:42:42.820 [DEBUG] [.binding.miio.internal.handler.MiIoAbstractHandler] - Received response for 0F8F154D type: CONSUMABLES_GET, result: [{"main_brush_work_time":143348,"side_brush_work_time":143348,"filter_work_time":143348,"sensor_dirty_time":35552}], fullresponse: {"result":[{"main_brush_work_time":143348,"side_brush_work_time":143348,"filter_work_time":143348,"sensor_dirty_time":35552}],"id":572}
08-Okt-2020 14:42:42.843 [DEBUG] [.binding.miio.internal.handler.MiIoAbstractHandler] - Received response for 0F8F154D type: GET_MAP, result: ["ruby2%2F261035341%2F8"], fullresponse: {"result":["ruby2%2F261035341%2F8"],"id":573}
08-Okt-2020 14:42:42.844 [DEBUG] [openhab.binding.miio.internal.cloud.CloudConnector] - Getting vacuum map ruby2%2F261035341%2F8 from Xiaomi cloud server: 'cn'
08-Okt-2020 14:42:42.845 [DEBUG] [enhab.binding.miio.internal.cloud.MiCloudConnector] - Send request: {"obj_name":"ruby2%2F261035341%2F8"} to https://api.io.mi.com/app/home/getmapfileurl
08-Okt-2020 14:42:43.753 [DEBUG] [enhab.binding.miio.internal.cloud.MiCloudConnector] - Error while executing request to https://api.io.mi.com/app/home/getmapfileurl :org.eclipse.jetty.client.HttpResponseException: HTTP protocol violation: Authentication challenge without WWW-Authenticate header
08-Okt-2020 14:42:43.753 [DEBUG] [enhab.binding.miio.internal.cloud.MiCloudConnector] - Received message is invalid JSON:
08-Okt-2020 14:43:02.079 [DEBUG] [enhab.binding.miio.internal.cloud.MiCloudConnector] - Send request: {"getVirtualModel":false,"getHuamiDevices":0} to https://api.io.mi.com/app/home/device_list
08-Okt-2020 14:43:03.027 [DEBUG] [enhab.binding.miio.internal.cloud.MiCloudConnector] - Error while executing request to https://api.io.mi.com/app/home/device_list :org.eclipse.jetty.client.HttpResponseException: HTTP protocol violation: Authentication challenge without WWW-Authenticate header
08-Okt-2020 14:43:03.028 [DEBUG] [enhab.binding.miio.internal.cloud.MiCloudConnector] - Response is not a json object: ''
08-Okt-2020 14:43:03.028 [DEBUG] [enhab.binding.miio.internal.cloud.MiCloudConnector] - Send request: {"getVirtualModel":false,"getHuamiDevices":0} to https://de.api.io.mi.com/app/home/device_list
Edit: setting the refresh interval of the vacuum Thing to zero suppresses the error message.