I upgraded from the transform ultra that I had for over a year to the gs2 a month ago. I had it for about a week when I went to unlock the screen and nothing happened. I removed the battery for a second and it started back up, no problem. Since then, it's happened about once every other day. I do the same thing as before and just pop the battery out for a second. I read another post by septemberain who had this problem while running dolphin. My phone is completely stock ICS from factory, not rooted, running stock browser, not even third-party apps. I have a hybrid silicone-poly case for it however it is not overheating, as I originally though might be the cause, but battery is cool as a cucumber. Any one else ever had/heard of this problem? Any suggestions? or should i bring it back to the Boost store where I got it? Thank you soo much for your time and attention.