[lakesidepark]

Possibilities?
1) the "multifunction" module is failing and powering down the circuit due to "low-power" fault. you did not say if the radio works when the car is off, or if it works and fails. Do your trunk and fuel door still work with the remote? Try this - use the remote when the car is running and the radio has failed, and see if it causes the radio to come on. If it does, it is resetting the module (because voltage is applied to the opposite side of the failure when the remote is used). I never fixed mine - I just soldered a jumper across pins 12 and 14 of the module. When it chokes now I lose my interior lamp but the radio stays on (I'll replace it someday).
2) There are TWO fuses that control the radio - one powers it when the car is OFF (twilight mode) and the other when the car is ON. If radio works with car off but not ON check those fuses again.
3) Failing heater auxillary water pump - will cause the multifunction module to "low-power" fault the radio circuit....strange but true.