The reason the radio is shutting down is due to either one of the speakers being partially blown, or a pinched/shorting speaker wire in the vehicle. To test this, try disconnecting the speakers altogether, and run the unit for awhile. If it doesn't shut off, then one of the speakers or wires is causing it to shut down.
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would that cause it to turn off and stay off even after shutting the truck off and restarting?
yes and yes... but there arent any loose wires.... what happened was i took out the factory speakers and put in new ones same size... on the front two 5 1/4'' i spliced in some tweeters, like i said earlier all was well till about mid song then the head unit shut off, dont know if that will help you or not