This is the third time this has happened. This morning I woke up and went into my fish room to feed my fish. When I got to my 55 gallon I noticed my XP3 wasn't working. The return water was not comming back into my tank. This has happened to me before. About 2 weeks ago I had noticed the same thing. I unplug the filter and plug it back in and it starts back up like nothing was wrong. The first time I took the filter appart thinking there was a clog or something but nothing. Is this common for XP3 to just stop working?