I would usually advise people to unscrew the bottom half of the master socket and plug the microfilter and router into the main socket under the front cover you remove with the 2 little screws. This disconnects and bad wiring you might have causing a fault. It is a little awkward when you have to move your PC to your master socket though. I would try it for a few hours and see if it is ok. You should have an idea if it would have disconnected in that time seeing as it is so frequent.
I would not plug in a phone while you are testing it either in case the phone is causing a fault. Don't worry no one ever phones you anyway
