We've had the door on our coach "pop" open a couple of times. We don't have a Drivers Door, just the one door by the front passenger seat. I never could really find a reason for it happening other than maybe flex of the coach body.
For a cure, we now have it on our check list to turn the deadbolt on the door. Our door cannot "pop open" when the deadbolt is engaged.
Hmmmmm, interesting. I have a 2004 Sunrise (M30), and have not had the driver's door open on me, but I've only had the rig for about a year and a half. In fact, in order to open mine, I have to push it against the coach (from the outside, or pull it from the inside) to release tension before the latch will operate and even allow me to open.
You don't stop playing because you grow old...You grow old because you stop playing! 2004 Itasca M30W
Took the lock out of the door and soaked it in mineral spirits. Locking tab appeared to have been sticking and lock wasn't properly catching. Lubing didn't seem to cure it but soaking it appears to have resolved the issue. We will know for sure when we take the unit out for a run.