I think that the issue is from the hardware. Cause i tested many times and all comes to freeze. When i first recevied the phone, it on WP8(150). Download apps like Facebook, Lock Srceen ... Games ... It run perfectly for the first two weeks. But when someone call me, it is the first time freeze the srceen and the other times come often. Soft reset for couple times worked! But just 2-3days it freezes again. I notice when put out from pocket (little warm the srceen), when run many apps(phone warm), even when i do nothing (normal heat phone) still freeze!
And i install the DP from 8.1(899) to latest 8.1(200) still freeze like those sittuations above! I also have the 822 from VZW too but it has no issue like the 928 (from 8.0 to latest DP8.1(200))!