One of my p9 units is having problems. When I plug it in, it will pick up signal and be stable for a while but eventually (sometimes 10 minutes, sometimes an hour) will "lose signal" and I lose network.

I tried moving it right next to the master p9, and this still happened, so it isn't a signal strength issue.

Putting the other satellite unit in the same place, there are no issues or drop outs so I can only presume this unit is faulty.

What can I do to verify this and how can I order a replacement unit?