My radio start doing weird thing like that and one day "pop" nothing dead no power nothing. I took it to the dealer and they had to order a replacement radio. After two week it came in, I left the dealership got about two blocks away was going to start loading my cds back in and bam dead.
I take it back and the want to keep it for a day to see if there is a wiring problem. None found, they order another radio, and I go back again. This one is working but the radio had old operating system. I found out that the radio was not new, but a recon.