Can't controll Hampton Bay Zigbee fan controller (getting "Message Send Failure")

Running supervised via docker on Synology Nas.

HUSBZB-1 stick.

I have 6 Hampton Bay Zigbee fan controllers throughout the house, with Sylvania plugs acting as repeaters. 5 of the fans are working well.

With one of the units, any attempt to control either the light or the fan fails. The log shows “message send failure.”

I’ve tried restarting HA multiple times, and removing and re-adding the fan. After re-adding, it works for a few minutes and then stops. The unit worked fine with Wink.

I am very new to HA and am unsure how to interpret all of the log info, but below are the lines that seem relevant.

I’d love any assistance as this is driving me nuts and lowering the WAF considerably.

2020-05-25 14:12:51 DEBUG (MainThread) [homeassistant.core] Bus:Handling <Event call_service[L]: domain=light, service=turn_off, service_data=entity_id=light.king_of_fans_inc_hbuniversalcfremote_becf1600_level_on_off>
2020-05-25 14:12:51 DEBUG (MainThread) [bellows.ezsp] Send command sendUnicast: (<EmberOutgoingMessageType.OUTGOING_DIRECT: 0>, 0xa85f, <EmberApsFrame profileId=260 clusterId=6 sourceEndpoint=1 destinationEndpoint=1 options=320 groupId=0 sequence=150>, 151, b'\x01\x96\x00')
2020-05-25 14:12:51 DEBUG (MainThread) [bellows.ezsp] Application frame 52 (sendUnicast) received: b'002a'
2020-05-25 14:12:55 DEBUG (MainThread) [bellows.ezsp] Application frame 63 (messageSentHandler) received: b'005fa8040106000101400000002a976600'
2020-05-25 14:12:55 DEBUG (MainThread) [bellows.zigbee.application] Received messageSentHandler frame with [<EmberOutgoingMessageType.OUTGOING_DIRECT: 0>, 43103, <EmberApsFrame profileId=260 clusterId=6 sourceEndpoint=1 destinationEndpoint=1 options=64 groupId=0 sequence=42>, 151, <EmberStatus.DELIVERY_FAILED: 102>, b'']
2020-05-25 14:12:55 DEBUG (MainThread) [zigpy.device] [0xa85f] Delivery error for seq # 0x96, on endpoint id 1 cluster 0x0006: message send failure
2020-05-25 14:12:55 DEBUG (MainThread) [homeassistant.components.zha.core.channels.base] [0xa85f:1:0x0006]: command failed: off exception: [0xa85f:1:0x0006]: Message send failure
2020-05-25 14:12:55 DEBUG (MainThread) [homeassistant.components.zha.entity] light.king_of_fans_inc_hbuniversalcfremote_becf1600_level_on_off: turned off: [0xa85f:1:0x0006]: Message send failure
2020-05-25 14:13:01 DEBUG (MainThread) [bellows.ezsp] Send command nop: ()
2020-05-25 14:13:01 DEBUG (MainThread) [bellows.ezsp] Application frame 5 (nop) received: b''