crwdns2933897:0crwdne2933897:0

Why does my phone keep vibrating?

My phone randomly started vibrating yesterday and it won't stop. I turned it off and even factory reset it and it's still vibrating. Hasn't stopped since yesterday.

crwdns2934089:0crwdne2934089:0 crwdns2934093:0crwdne2934093:0

crwdns2934109:0crwdne2934109:0

crwdns2853045:0crwdne2853045:0 crwdns2853046:0crwdne2853046:0
crwdns2889612:0crwdne2889612:0 0
crwdns2934285:0crwdne2934285:0