big hoss

this has been happening to my truck for 8 months radio and sometimes dash goes black , cant control radio or nothing , like its froze, chevy techs say there's no code so they cant fix, book mechanics not real mechanics any more, nothing they can do until they see it for them selfs , never happens near a chevy garage, took pics and showed them , and now they say that several are like this ,they cant figure it out, buyer beware , all i can do is document every time this happens and i guess go for the lemon law, cause chevy techs are not smart enough to figure it out. 14000 miles only and nothing but a headache.