The funky master socket has a fault due to the inbuilt filter.
Max could go back to the test socket put a dangly filter in and see if the issue goes away.
Presumably it does work though, because they're posting here?
It looks like the speed is a bit lower but the connection is actually working, if he wasn't obsessing yet again over stats he wouldn't even notice.
I just don't know what indulging this habit does for him or us, I know people get angry when I say this but I am sadly being proven right.