Factory GM radio dub tee ehf?

My buddy is working 7 days a week doing harvest... he's driving an 02 GM truck, and the radio keeps cutting out... it'll shut itself off and flash four times then stay off for a long time... anyone have any ideas?
No aftermarket speakers or anything....
anyone heard of thsi before?

 
it's broken //content.invisioncic.com/y282845/emoticons/fyi.gif.9f1f679348da7204ce960cfc74bca8e0.gif

Yeah, kinda what I'm thinking, but just in case....

four flashes seems like it might be trying to throw a code, and it works for a while... just thought someone might have a little gm specific knowledge.

 
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