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I wonder if anybody can give me some pointers.

I have 4x AV600 units in my house which have until this morning been working without issue.

Unit 1 = Sky Router
Unit 2 = PC in second bedroom
Unit 3 = Sky Q box downstairs
Unit 4 = Upstairs Bedroom (no devices connected as yet)

This morning the PC would not connect to the internet, if I opened the original power utility is said I was not connected to the local device. I disconnected all 4 units and plugged them back in and the problem still persists.
I found a newer utility and this will occasionally show the local powerline unit only, but within a minute it will disappear again.

Logging onto the Sky Router I can see heavy LAN traffic

i.e. When I rebooted everything there should be nothing connected using the LAN (PC is currently on WiFi)

in 5 hours -
Tx Packets = 41,300
Rx Packets = 44,786,840
Collisions = 2,113,477


Any ideas on what the issue could be?