Phone keeps going into DFU mode
I have a never unlocked iPhone 4, it is running 4.2.1(8C148) with baseband 3.10.1. I am currently using the gevey unlock sim. Was working great for the last 6 months. Now it is acting strange by spontaneously going into DFU mode. The screen goes completely blank, does not turn back on. I have to give it a few hrs rest, and then I can turn it back on!
When in DFU mode, if I connect to iTunes, it askes me to restore the phone with 5.0.1 software. (recevery mode)
Do u guys think it has something to do with the gevey sim card?
I have not jailbroken the phone ever.
Is there a solution to this problem?