Reply to Battery Problem for QX56

New to the forum
Have the 2011 QX56 ~VERY FRUSTRATED...
Before I jump in and share our issues, I do want to share a LESSON LEARNED.
We have had the vehicle jump started atleast 8 times in two years. In addition, we had to have it towed into the dealer once. Dealer has not been able to duplicate the issue. With that being said, a previous post mentioned having to have it towed as they could not get the electronic ignition to start. We ran into the same issue and I found that if you completely disconnected the battery (both positive and negative leads), waited 5 minutes, reconnected the leads, the vehicle would start right up.
I'm not a mechanic, but believe it may have something to do with the security system and ignition kill switch, and by pulling power to the battery, somehow resets the kill switch. You would think the remote would do that, however; I have found that only by pulling power to the battery, can you get the vehicle to start.
With this in mind, we still haven't figured out why the vehicle's battery will drain in a matter of minutes for the smallest thing. We have left the vehicle engine off with the radio on (dead in 15 minutes); we have left the vehicle engine off with the ACC on (dead in 15 minutes); we have also left a door open and the back hatch open, only to find the vehicle dead (not sure how long, but no more than 2 hrs).
Last night was the kicker.... We went out to eat, parked the vehicle in a public garage and left the vehicle with everything off and the alarm set. Three hours later, it was dead! Had to use the manual key to get in. Two hours later we finally got it started after getting a car service to come out and help. I had to convince them to disconnect the battery to get it to start. They didn't believe me, until it wouldn't start without doing that first.
You would think there would be a sensor that would detect low voltage and shut everything off to conserve the battery. We have owned lots of vehicle makes (BMW, Ford, Honda, Toyota, Saab, Chevy) and this is our second Infiniti. I have never seen a battery drain like this..... It's got to be an electrical issue that is pulling power or a design flaw.
It is now with the dealer and will stay there until they figure it out.
Any ideas?