From time to time, the ethernet ports on the back of our router just stop working. Lights still flash, wifi still works, but the ethernet ports themselves just stop.
The only fix I've found is to log into the router and trigger the network diagnostic - once that hits the "checking ethernet connections" step, suddenly everything springs back to life. Nothing else (changing cables, changing kit connected to the ethernet ports, etc.) works.
There's nothing in the logs - I get a "No ranging response received" error pretty much once per day, but not having this issue that often and I don't think the times line up for the days when both happen.
An engineer who came a while back to fix some other connection issues (now, thankfully, resolved) told me point blank that what I was describing wasn't possible - but I've tried everything else I can think of, over the course of six months or so, and this is definitely what is happening.
Obviously without knowing what triggers the problem I can't reproduce it on demand; and we're relying heavily on powerline networking to make up for the lousy performance of the wifi, so can't afford to leave the issue unfixed until an engineer arrives...
When I told the engineer who came out to fix some unrelated broadband issues, he basically told me what I was saying wasn't possible and that the engineers had been told not to do hub swaps unless they were totally convinced it was faulty (which is fair enough, but difficult to prove with an issue that happens seemingly at random).
I am going to borrow a proper router, put the hub in modem mode, and see if that makes a difference - but I believe all the ports go, when they go, so I can't see why it would unless whatever's making them switch off is related to a routing function somehow.
If anyone from the VM team is monitoring (@Travis_M?) is there a way for me to get my hub swapped without having to call support and go through resetting it etc. etc.?