Is it possible for a jaw to pop out and then back into joint on one side doing something no more violent than taking a small bite from a not-tough wrap?
It happens to me a couple of times a week. Try moving your jaw back and forth sideways, pushing in on your chin or lying back with your neck on a pillow and your tongue on the top of your month. No, I don't know why those things help, but those are the things the TMJ guy told me to do. They all relax the jaw muscles.