I have never jaw problem.
The sound is squeaky. I noticed today that jumping up and down also evoke the sound but it is milder. The funniest is that the head position also makes big difference: if I tilt my head on right side at 90 degree (my right ear has the sound) or low down my head > 90 degree front, the jaw movement no longer make the noise!! But it remains the same if I tilt my head on the left or back at 90 degree.
I will see if I can find something more strange.
I do not believe there is any serious problem, but it must have an explanation.
Thanks for you all to help me solve the puzzle.
Sand