I have nexus 4, two days ago upgraded to lollipop. I hate it. My phone is totally buggy now!! It drops my out going calls 9/10 times, my sent SMS are delayed by hours, keyboard has a mind of its own, it still makes a sound when I receive SMS but no longer displays notification icon (yes I've tried tweaking the settings), photos doesn't show all my pics I had. That's just the most annoying issues I'm having, there's more! I really don't like the funtionability of it at all! Please tell me there is a way I can undo this update and go back to 4.4.4!!!!!!!!!!!!