Push start randomly no start. No crank. Not click. Nothing. Vehicle qill work for cluple days or a week, then issue happens again. The Light's come on on dash but that's it. Push the button for the second time and turns lights off. Currently at the dealer for the 5th time now. They have replaced everything that has come up code wise. So far they have replaced a hood latch, fuel pump module, transmission module, and body control module. Dealer has been contacting GMC engineers and they are now scratching theirs heads/ not sure anymore... bought the vehicle used from a licensed dealer in February this year. It has been at the dealer more then I have had it.. GM customer care says to keep bringing it back... Any ideas?