I have a 2013 335i sport, which I bought new in Dec., 2012, and it's been hassle free and a great ride. However, the other day when I parked it and walked around to the other side, I noticed the gas flap was partially pushed out from its closed position, and unlocked. It wasn't completely open, but I could see it was clearly disengaged from its locking post, and even though it was locked, I could easily lift the flap to gain entry to the gasoline port. I hadn't gassed the vehicle in several days and always check the flap when I finish, so this was surprising. I then locked the flap and found when I applied pressure or pushed the flap while the vehicle was locked, it would move out maybe a quarter inch, but still remain locked. However, when I then used the key fob to open the vehicle, the flap would completely disengage from it's locking post, moving out partially, without any intervention on my part. This is a problem, since once it's clear of the locking post, I could drive for days without realizing the gas flap was wide open. So, today, I took it to my service manager, and duplicated the above procedure for him. He advised he hadn't seen this happen before, and was prepared to order me a new locking mechanism for the flap, when he decided to try the same procedure on another 335i and got the same result as my own! So, apparently this has been designed that way, for now, I don't have a good solution, except to periodically check the flap to ensure someone hasn't brushed up against it or pushed it to cause a recurrence. Has anyone else seen this occur on their vehicle?