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This morning my xperia z3 compact started vibrating , and it doesnt stop. I tried factory reset, didnt work. Help please
What if you repair the phone with XC
Alternatives on How to backup Xperias
Hi @hasox, I'm sorry to hear about this. 
Have you performed the software repair that was suggested by @uliwooly?
If the phone still won't stop vibrating after the software repair has been performed I would suggest that you remove the SIM- and/or SD-card in your phone.
If it's still vibrating please get in contact with your Local support and they will be able to assist you with getting your device sent in to a authorized service centre.
Please keep me updated! 
none of them worked, i opened the back cover myself and broke that little vibration thing. I dont have vibration any more. Also, I am done with Sony, what a problematic device !