how to fix my lenovo a5000 that vibrates every 5 seconds and restart without logo

[AC Question]

when i press and hold the power button it will flash and vibrates showing nothing even the " lenovo ". i just download and app the can set it to recovery mode because my phone haven't. even when i charged it will do the same...can you help me?

 

[kicsy023]

This is a software bug. You have to try a hard reset. :S