Connecting one device causes others to drop out.
We have several PA7017 and usually they work fine. Today I have a headache:
Device A is adjacent to the main isp hub.
Devices B, C, and D all connect to it fine.
Often but not always, connecting device E to A, causes E and A to now exist in their own group, while B, C and D are in their own group, which sadly does not include internet access.
I tried putting a different device in the socket where E is located, so I don't think it is a faulty unit. (We have multiple spares, ready for use in more rooms)
Any ideas what I can try or look at to make this work, or identify the cause?