I have an iPhone 4 running iOS 5 beta 4. I have been running beta 4 since the day it was released with very few issues. I plugged my phone in last night right before bed like I do every night and when I woke up this morning, it had the spinning circle on it. I had to do a hard reset (pushing the power button and home button together). The Apple logo comes up and then it goes to the lock screen where the phone immediately freezes. After staying there for a couple of minutes, it goes to the spinning circle. Any ideas on how to fix this or why it's happening?