[MDimitri]

I had something like that happen to me a short while back, all I did was buy a new heavy duty battery and all my problems were gone. Check your battery and it's connections on both the battery and the auxilary power red box next to the drivers side engine manifold, check to make sure you don't have a loose ground and the connections are clean, if this all looks good then it just might very well be the switch.

Good Luck.