2007 Touareg Full Electrical Power but No Crank

Original owner of much loved Touareg (appx. 188,000 miles). In the last year the car has "frozen up" about a dozen times at random during start up. The seats will adjust, the lights will come on and all the electronics work like normal, but no start, no crank, and no noises from the engine.

Took it to the VW specialist repair shop (not the dealer, they are a JOKE) and they could not find anything wrong except to say it might be the drivers side door lock and the problem (obviously and electrical one) has to do with the alarm system (though no error codes are found).

After spending the better part of the day fumbling with the car the mechanic disconnected the battery (not easy to do BTW) at the positive terminal and after reconnecting, the car started back up again (had to reset the clock and stuff). This fixed the problem but the mechanic could offer no explanation or solution.

I am at the point where I carry around a 10 mil socket and have a ten minute routine to disconnect the battery when this happens (took my mom out to dinner last Sunday night and it froze up in the parking lot after dinner and that was the last straw). The time to get a permanent fix is now. Any hints, helps, tips, or suggestions?