OK, I just confirmed that the AP not available bug affects your car whether or not you have Beta enabled. Just having Beta 10.3 installed activates the bug. I kept Beta disabled and started a drive this morning. Normal AP worked fine. I put the car in park and then started another drive. Still had Beta disabled. AP disengaged within 10 seconds. So, not enabling Beta is pointless as far as keeping the bug from happening. After the car wakes up from a sleep, you get one drive before AP is disabled. Once you put the car in park, the car has to go to sleep to get AP back. Resets and Power Offs do nothing, the car has to sleep. As pointed out above, disable everything that keep the car awake: Sentry, Summon Standby, and Cabin Overheat Protection. I don't know yet how long the car takes to go to sleep.