Lighting, Light Fixtures, Ceiling and Exhaust Fans - Very odd problem

I have had my current home theater set up for about a year now. In my last house, I was having many problems with my projector and satellite receiver. I noticed that I was having heavy power spikes and dips and went out and bought a very heavy duty computer battery backup/ voltage regulator. I added up the needed wattages for each device and ended up purchasing a 860 watt backup. Since i have owned the back up, all of my problems have disappeared.

Recently I moved into a new house. In this house, I have the exact same set up as before. Nothing has changed and my stereo receiver, satellite receiver, and projector are once again hooked up and running. This time though there is a very strange problem. Everytime I shut off a light or shut off a ceiling fan in the upstairs (where the living room/home theater is located) the sound cuts out for about a second and then comes back on.

At first, I thought that I must have hooked too much stuff up to the back up and the power surges were coming into play. So i unhooked the projector to make sure i wasn't overloading the unit, but the problem still happened. Then I decided to see if it was related to just that breaker. I moved the power cord from the living room to the dining room. These two rooms are on completely seperate breakers. I tested it again by flipping the living room fan off and still the sound cuts out briefly and comes back on. The same problem happens with the kitchen light. My last test to try and keep me sane over this problem was to completely unhook the battery back up from the wall outlet and run the home theater components on the battery back up's battery. At this point, there were no physical connections to any wall outlet and i was running off of stored power. As soon as I flipped the living room fan OFF, the sound cut out.

I have heard of electro magnetic frequencies caused by bad electric wiring causing problems and was wondering what everyone's take was on my problem and if there are any easy solutions i could perform myself. The townhome i am in is a rental and i think my landlord will blow me off as he is always busy. Thanks for your help!

but I'd first turn off the breaker(s) for these switches. Then I'd remove the cover plates, pull the switches out-but don't disconnect any wires and check for loose connections.

Some outlets/switches are wired by just pushing the wires into holes in the back of the devices, generally these connections aren't reliable. If you find this, try moving the wires from the holes to the screws located on the sides right next to the hole the wire came out of.

If not, then I'd try replacing both the switches and see what happens.

I hope this helped!

First you need to determine if the sound is cutting out from the amp or to the amp.
That is, is the input signal to the amp cutting off or is the something in the amp cutting off the signal to the speakers. This is a very strange problem and I can't think a thing that might cause this especially since you are running the system on a UPS.

Does the ceiling fan have a remote control? If it does, that could be a source of emr causing intermittant problems.

I am pretty sure it is not the speakers because it even happens on my recorded programs. I have a DVR and one time when it happened, and no one had been messing with any light switches, I rewinded the program back and it happened at the exact same time. That means that while the program was recording, the glitch took place and affected it. I just don't understand what to do.