Now that I think about it, the rca outputs for the front and rear didn't work correctly I had to use one channel from the front and one channel from the rear.
I first thought it was this problem but when it happenned with a different dock plug I wasn't sure.Also I tried to use the AUX in rcas once and they wouldn't work either.
I don't know if related to the rebooting problem
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MIKE 80Gb RIO