Get a replacement its a hardware issue. I had the same problem except all my vibrate for calls, haptic feedback, and anything else that vibrates would cut out randomly
Be cause the vibrate motor is obviously going bad.
Especially when I did a factory reset and it still did it from the minute I turned it on, and if he has to tap the back of the phone to get it to work that's a dead give away that it's hardware.
I have a Droid Razr and I have vibrate on touch in setting selected and when I text or something the phone will quit vibrating sometimes. Once in awhile I found the phone will deselect vibrate on touch sometimes but today I found the other times if I gently hit the back of the phone it will vibrate again, which makes no sense. I e- mailed them and will let you know what they say.
Talked to Motorola they have not even heard of this problem. Had me try some things over the phone that did not work and I am still having the problem. There last answer was to return my phone to factory settings and reboot everything and if that doesn't work call them again!!!!!!
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