You dont say if your using a power conditioner or not. It could be that you have something on your incomming voltage line like a switching power supply. Make a note of when it happens most and try to narrow the environment, time, weather, traffic if in a apartment, and perhaps whats happening around your area, like what is on in the house, what are you using that might tap into the electrical.
It might sound like alot but I traced a snap down to a lighting fixture that had a bad ballast.
It might sound like alot but I traced a snap down to a lighting fixture that had a bad ballast.