Nokia Lumia 625 switched off on its own and i cant turn it back on. what do i do?

[Windows Central Question]

This has happened twice before. There's still a lot of battery left in it, I'm not using the phone at the moment and when I need to use it, I found out it has switched off on its own.
i can't turn it back on. Tried removing the SIM and inserting it back in. Switched on a couple of times and sitll nothing.
I left it for a few hours, maybe it would help.
It's been 4 hours now and i can't still switch it back on.
What do I do now? Pleaseee!!

 

[srikanth reddy4]

Plugin the charging and try

 

[henocksandy]

Try holding the power button and volume down button for 10-15 seconds