Help! H3 won't start!
 

My H3 is fine, it's my Mother-In-Laws. Her 2006 has had the PCM replaced and reprogrammed, and it's still won't start at times. What seems to be common is only when it's hot out(85 degrees or hotter). Is the PCM overheating?
Won't even turn over, so not the 10 minute security lockout. The shop she's had it at for 6 weeks can't figure it out either, even after they took it to a GM dealer to get the new PCM re-programmed.
Seems she can drive it to work, or anywhere, as long as it sits for more than 15-20 minutes, then it will start right up. If she gets back in and wants to go in 5 minutes or so....nothing! Dash lights only, no starter.
Don't know what else to do. Any suggestions?
Battery checked and charged.
PCM replaced and reprogrammed
Security module was replaced last year

With all the overwhelming responses......
Turned out to be a bad solder on one of the new PCM wires. She wasn't charged.