Dear, I do not know whether it would be appropriate to bring in a technical assistance, but try to see the following. Check the circuit solder micro vibrator motor is not cracked, it causes poor contact. so when pats works and then returns to the default. remaking this solder can be an arduous task and requires soldering iron low watage not to further damage. Tools: Magnifying Glass, trilobular screwdrive, screwdrive # 000 and patience! Good luck!

Hello to all , Possibly the micro vibrator motor was locked, nothing that a good pats to return to work. Thanks, good luck