Lately, my phone has been freezing a lot, mainly during calls. At the end of a call, the screen will freeze and continue the call, not letting me hang up or press any other buttons, causing me to have to pull the battery. Its also happened a couple times after getting a text. All I can do is pull the battery to unfreeze it, and its getting rather annoying to do 2-3 times a day. Anyone else having this problem and know how to fix it?