I recommend a hard reset after any OS update. Once the update is finished, backup any data you might have on the phone that's not already in OneDrive.
Then power the phone down. Once off, wait 30 seconds (just to make sure). Hold the volume down button - and press the power button. After the Microsoft logo, you'll get an ! sign. You can then release the volume down button.
Press: volume up / volume down / power / volume down
That will initiate a hard reset - re-installing the OS from scratch (wiping all data off the phone - hence the need to backup any data not on OneDrive).
Setup the phone - I recommend not restoring from backup. I know it's a pain in the rear, but seems to be the most stable solution in case some app or setting was causing problems.
Let the phone sit for a minute or two when you get to the Start screen. Then go into the Store and let it update all the apps. Once that's done you can start installing your other apps by going into your Library in the Store and downloading them with the down-arrow symbol.
See if the phone stability improves - 9 times out of 10, that'll fix your issues. If your phone is still crashing and rebooting, you may need to have it replaced.
02-23-2016 12:57 PM