cold weather radio problems

[DARKSCOPE001]

Hey guys. I have a strange problem. My radio has been acting up recently but this morning (got off work at 6 am) and the temp outside was maybe low 50's to mid 40's Got in the car and started up some tunes and allowed the engine to warm up and let all the people who just fly out of the parking lot get out of there.

Well I went to hit the track change button and my radio powered down and ejected the cd. so i pushed the back in and tried to change tracks again. same problem. so i took the cd out and turned on the radio. every button i hit would power down the radio. then when i finally got some heat into the car i could start using the radio but there was no display. it was backlit but no information was being displayed. finally when i got home about 30 min later when the interior of the car was good and warm it started working.

Any ideas? I bought this car "toyota certified" with 20k miles on it and i have the platinum service plan (dont laugh and yes i know im an idiot) so i would think this would be covered.

Also seeing as i dont trust most dealership or big chain mechanics as far as i could throw them i wanted to do my own maintenance. what all do i need to do to keep toyota from telling me "we arent doing that because you voided your waranty by not complying with this service"

Thanks
Sean Scott