I'm trying to controll device vibrator in a gaming library. I have recently found while testing on 6100 device that app freezes for a while. Anyway It happens only with some builds. I was unable to determine what changes in the code can affect this problem. Even trying to have thread dedicated to vibrator controll leads to same problem.
I did not experience the problem on any emulator (series 40, series 30) nor on a 3410 device.