ceiling fan remote making other lights dim

I have two upstairs bedrooms, a master bedroom and a guest room, with some strange wiring. Both rooms have ceiling fans, but the lightswitch on the very far end of the master bedroom controls the power to the ceiling fans in *both* the master bedroom and the guest room. It is the only switch for the two rooms. Needless to say, we don't use that switch. As a result, the only way to turn on the lights (or fans) in either bedroom is with the fan's pullchains.
So yesterday I went out and bought a Hampton Bay fan/light remote control unit for the master bedroom. Installed it and it works great: now I have a lightswitch for the light and fan in that room.
Problem is, ever since I installed it now the lights in the fan in the guest bedroom dim or brighten intermittently every 5-10 minutes or so (even when the fan in the master bedroom is just running without the lights or fan speed being adjusted). I can only guess it has something to do with the remote unit that is on the same circuit.
Any ideas anyone? Is this potentially dangerous?
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Sounds like you >are< using the switch. It's just always on. Replace the switch. Yes, it could be dangerous. You don't want to guess about wiring. You should also see if the circuit is adequate for the load imposed on it. If you don't feel qualified get an electrician.
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