Originally Posted by TwitchierFish
I updated the phone last week, maybe the week before but I'm not sure which update I'm on.
Go to Options -> Device -> About Device Versions you will see something like:
6.0 Bundle 2921 (v18.104.22.1686, Platform 6.6.0241)
Let us know what that says, these may be know issues for the version you're running though I've not heard of these symptoms before.
Have you tried a battery pull?