2002 dodge intrepid, alarm/remote start

I installed a Mars 32 Alarm/Remote Starter in a 2002 Dodge Intrepid. The First time We installed the alarm the customer had an issue when ever it got cold at night the unit would stop communicating,(would not lock,unlock,remote start) I called omega tech support they said it was the brain, we replaced the brain ran good 3-4wks. then get a call that the alarm isn't working(not communicating) , then when she open the door the alarm went off, when she took the key out the car kept running. I popped the hood and the hood latch didnt shutdown the engine, So i just pulled the fuse out the alarm and of coarse after I replaced the fused everything worked fine...

any s