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I used this phone for a long time with little to no issues. I recently went to something else and gave it to my wife. Phone was wiped and her account was used. Sometime after the setup the Dec security update came in. I'm not 100% sure if the issues happened after the update or started before.
Apps won't start, they just hang on a black screen. Stopping, force closing, cache deletion, re-install don't work. A reboot will work for a bit but the issue happens again. Not specific to any app, issue rotates around most apps she uses.
Battery will be in the top 3/4 ie 80%. A while later (within an hour) the phone will be off and show 6% when started. Then a reboot it will show 1% and turn off again. Plugging it in for a second will make it show 70+ % and it will be fine again?
I have not done a factory reset yet but it's the last step if there are no obvious ideas from you people in the know, it's been a bit so I'm outta the loop.
Thanks in advance.