Can fuse board effect wifi router

[Rooky007]

You said removing faceplate and connecting to the diagnostic socket fixed it, surely that means it's the faceplate filter that has degraded not some mystical demon behind your walls.....

Demon behind the wall.

As I tried the router and modem in the cupboard without the faceplate. But it all now on extension in lounge running at max speed I was told I'll get