Chromecast audiogroup from ONLINE to UNKNOWN

Hi ,i am using a chromecast audio group consisted by 3 google minis and 1 nest mini,to announce staff at my home.I get this in the logs

2021-09-01 20:28:33.046 [INFO ] [ab.event.ThingStatusInfoChangedEvent] - Thing 'chromecast:audiogroup:d9059b78-2bfa-4946-ba6f-aa6ca5e55e90' changed from ONLINE to UNKNOWN
2021-09-01 20:28:33.338 [INFO ] [ab.event.ThingStatusInfoChangedEvent] - Thing 'chromecast:audiogroup:d9059b78-2bfa-4946-ba6f-aa6ca5e55e90' changed from UNKNOWN to ONLINE
2021-09-01 20:28:33.341 [INFO ] [ab.event.ThingStatusInfoChangedEvent] - Thing 'chromecast:audiogroup:d9059b78-2bfa-4946-ba6f-aa6ca5e55e90' changed from ONLINE to UNKNOWN
2021-09-01 20:28:33.454 [INFO ] [ab.event.ThingStatusInfoChangedEvent] - Thing 'chromecast:audiogroup:d9059b78-2bfa-4946-ba6f-aa6ca5e55e90' changed from UNKNOWN to ONLINE

It happens nearly every 2 minutes.Is that normal?Is there another way to announce staff to all my minis at the same time?

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