Why is my Nokia Lumia 830 spontaneously restarting itself several times a day?

[WPCentral Question]

My Nokia Lumina 830 restarts itself while I'm reading from my Kindle App, playing a game, reading my email, whatever. It happens several times a day, sometimes only 5-15 minutes before it happens again. This only started after I updated to Windows 8.15 Update 2. This didn't happen before then.

 

[Amit Mishra3]

Do a hard reset n don't restore backup... I'm sure it'll resolve ur problem... Same thing happened with me n after resetting everything became normal.