I have the same phone. It does this to me all the time. I suspect that it is just a general problem. I end up taking the battery out for a few minutes and then restarting the phone. Usually after that it's fine again. This doesn't cure the problem forever, meaning that it will happen again, but next time just quickly remove the battery and restart. Hope this helps.
Press the "F8" key before the system boots into Windows. This BIOS screen appears.
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