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Edited by lollb at 2017-8-10 18:40 \n\nHi.
I have had this problem too.
What OS version are you using? If it's 7.0, you may need to downgrade to 6.0 and then rerun the update.
However, before you do so, I'd suggest you look to Sensor testing in Recovery menu to test that the hardaware side of things is working ok. To do so, start the phone in recovery (power button + volume up) and scroll down to sensor tests. run all of them and see if any fail.
If none do, then you may need to reinstall the OS.
If the phone is no longer under warranty, I believe there are quite a few unofficial ROMs available out there (Eg. Lineage OS, CyanogenMod, etc...), so you could also install one of those.
After changing OS to lineage, i never had any problems afterwards.
You can also follow this guide.
Let me know how it goes.
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