While this is an old post resurrected, it is an issue I recently dealt with on our coach, also an '05 Bayview 4. Perhaps the following may help:
The outside door handle on ours was too hard for my wife to operate, (it didn't trigger the latches until it was pulled almost 90 degrees) so while we were at ARG for a Norcold repair, we asked that they adjust the mechanism. Once they finished, the change in handle movement was dramatic - the door mechanism triggered almost immediately. The tech explained how he had adjusted the actuating rod turnbuckles to shorten them up the linkage length and take the play out of the mechanism. Sounded like sound wisdom and it worked great for about an hour when all of a sudden the door popped to the safety detent, and the step light came on as we traversed a section of rough pavement. Pulled off, closed the door tightly, set off again, and it all happened again several times. Fighting to get to our next destination where we had a long-reserved, non-refundable costly travel ticket, we continued on to our next destination. There, I decided to investigate the issue myself. Found that the adjustment made at ASG allowed for quick release, but conversely did NOT allow the latch to fully bottom on the pin to fully lock the door. Loosened the lower turnbuckle and backed it off a few flats so the latch bottomed and locked it into place in the new location. The handle now released about mid-travel, my wife can operate it and it does not open anymore while underway. So, while ours was an adjustment, it's feasible that a dry, binding mechanism could cause a similar failure of the latch engagement and an untimely popping of the door to partially open.