04-03-2014 16:45 - edited 04-03-2014 16:50
Check your on the newest firmware available.
Also try a soft reset or a hard reset but make a back up as this typically deletes data.
Quote from Nokia Discussions.
"Did something happen before you encountered this issue? You can press the Volume down and the Power button until the phone reboots. This process will refresh the device software. You can also follow the troubleshooting steps shown on this link:"
If no help your under warranty so seek assistance from a Nokia Carepoint.
on 04-03-2014 18:16
OnePlus 6 (O2 & Sfr), Z3 Tablet (Three UK), iPhone 8+ (EE)