My Ionic Breeze GP began losing power occasionally but I could shake it and get it to turn back on. It got worse and worse until it would not turn on anymore.
The problem on mine is the micro switch that detects whether the collector plates are inserted or not, so it is part of the safety mechanism. There is a about a one-inch cylindrical piece of plastic on the front of the collector plate handle. This cylinder goes through a hole and pushes on the micro switch (actually a plastic cover over the micro switch).
On mine, it appears that arcing inside the switch caused it to get hot, deforming the plastic a little bit and apparently ruining the inside of the switch.
The following URLs describe the switch, but I have not found a retailer that carries it:
Another of the same model switch is used in the back of the unit to detect whether the rear cover is on (over the UV bulb).
If I cannot find a replacement, I am thinking of either bypassing the bad switch entirely or swapping the switch from the back. Either way would defeat a safety feature so it's probably not to be recommended, but I consider the sacrificing the switch for the back cover to be introducing only limited risk, so I might take that route if I have to.