Coils quit firing, no signal but has 12 volts

What is your question?

This thing is driving me crazy, I have carried it to two separate shops with no results. At times it will crank and run fine, then all of a sudden it is if you just shut it off. Also, the security will alarm at times while unlocking the doors while at other times it will not. I've replaced the crank sensor, not that. I'm wondering if it may have something to do with the factory security system? Any info or ideas would be greatly appreciated. I have checked everything that I can think of and everything checks out fine other than the security system at times act up. Is there a way of disarming or by passing it to see if that may be the cause?