Yamahareceiver binding with strange behavior

I am working with openHAB 2.2.0 Build #1084. I experience some strange behavior with my Yamaha binding. When switching the receiver’s power state, I receive the following log entries:

2017-11-21 21:50:39.427 [me.event.ThingUpdatedEvent] - Thing 'yamahareceiver:zone:5f9ec1b3_ed59_1900_4530_00a0deb518f7:Main_Zone' has been updated.
2017-11-21 21:51:20.851 [ome.event.ItemCommandEvent] - Item 'eg_wz_aYamahaPower' received command OFF
==> /var/log/openhab2/openhab.log <==
2017-11-21 21:51:20.857 [WARN ] [nternal.profiles.ProfileCallbackImpl] - Cannot delegate update 'OFF' for item 'eg_wz_aYamahaPower' to handler for channel 'yamahareceiver:zone:5f9ec1b3_ed59_1900_4530_00a0deb518f7:Main_Zone:zone_channels#power', because no handler is assigned. Maybe the binding is not installed or not propertly initialized.
==> /var/log/openhab2/events.log <==
2017-11-21 21:51:20.870 [vent.ItemStateChangedEvent] - eg_wz_aYamahaPower changed from ON to OFF
==> /var/log/openhab2/openhab.log <==
2017-11-21 21:51:20.878 [WARN ] [nternal.profiles.ProfileCallbackImpl] - Cannot delegate command 'OFF' for item 'eg_wz_aYamahaPower' to handler for channel 'yamahareceiver:zone:5f9ec1b3_ed59_1900_4530_00a0deb518f7:Main_Zone:zone_channels#power', because no handler is assigned. Maybe the binding is not installed or not propertly initialized.
==> /var/log/openhab2/events.log <==
2017-11-21 21:51:39.452 [vent.ItemStateChangedEvent] - eg_wz_aYamahaPower changed from OFF to ON
2017-11-21 21:51:39.479 [me.event.ThingUpdatedEvent] - Thing 'yamahareceiver:zone:5f9ec1b3_ed59_1900_4530_00a0deb518f7:Main_Zone' has been updated.

I can’t tell when this behaviour occured. I already reinstalled the binding without any effect. I can’t operate the receiver. Any idea what’s going on?