It sounds like there are potentially a number of reasons for inexplicable flat batteries or false battery discharge warnings.

Locking the vehicle in my locked garage at night is a pain. On balance do people recommend I go ahead and start locking it to preserve battery? Seems a design flaw to me.....

Also - is there any way of programming the vehicle to self-lock after a period of time - say an hour? I understand the risk of locked keys, but think I would still use this if available.