Why can't I unlock my Lenovo A536?

[AC Question]

some times my lenovo A536 locked. the power buttan not work to unlock my device

 

[B. Diddy]

Re: can not unlock my lenovo A536

Welcome to Android Central! Are you saying it sometimes works, and sometimes doesn't? Or it just never turns on? Either way, you will probably have to bring it to a repair shop, or contact Lenovo if it's still under warranty.