Keep getting A Unknown signal to my CM15A setting off chime

[AccurateOne]

Do you disconnect the USB from the CM15A or the computer end? A hanging USB cable connected to the CM15A could be a problem. I believe a awhile back someone reported strange happening if the USB cable is hanging from the CM15A and not connected to the computer end.

The USB was disconnected from both.

[dave w]

Update: Chime went off a 3:06 am this morning.

This morning I placed a plug in filter in front of the CM15A.

Could the CM15A be sending a random A6 out?

I placed a ghost appliance module at A6 as JMac suggested. I set it to the off position. We will see if the CM15A sends out a signal to turn it on.

The filter will prevent CM15A from receiving or transmitting PLC. Is that what you want?

Even if CM15A is sending random A6 ON, how is that ringing your chime? What does the activity monitor show at 3:06 AM?