Messages being delted (stock messaging app)

[25cents]

I've had this problem from the get-go, every couple of weeks/months all of my messages get deleted. They do eventually come back (at least I'm hoping that's still happening), but it's a real pain in the tukus. I'm running BB 0.5, and the only app that interacts with the messaging app is Tasker - but I was having this issue before root, and before tasker. Anyone know why this continues to happen? I couldn't find anything.