I gunna say its the battery or the alternator going bad. GO to a o riellys or autozone and have them run battery and alternator test. The alternator test should be done with the car on and battery with the car off. Im guessing maybe a diode is going bad and causing things to pull power away from certain things. But i could be wrong. So I would run those tests to see whats up.

or maybe one of the cables off of the battery conections is going bad too.