2004 H2 Won't start

[TriStar]

3 months ago while i was still under warranty i got in my truck turned the key and other than my seat moving into place, my stereo coming on, NOTHING i assumed it was my aftermarket alarm that i had installed two months prior so i called my alarm guy. He checked it out while still dead and verified that he was not to blame so i called a tow truck to take it in. While i was waiting i tried it one more time and it started!!!. I assumed it was something that the alarm guy acctually did and the problem was resolved. My warrany expired and a month ago it happened again. Again i called a tow truck to take it in and again i tried it while i was waiting and again it started. This has now happened 4 times and is frustrating because i need it broken to take to the mechanic. I called my local Canadian Hummer dealership and told him my situation and he suggested i bring it in, let them drive it for awile until it goes down again and they could fix it. "Not under warranty". Has anyone had this problem????? I have allready tried putting the transmission in N and holding to the left as someone else reccomended.


Thanks in advance

Peter