My phone keeps crashing during calls. i reset holding down the refresh and power buttons simultaneously but now even that is not working.

hello all. i need help and hoping come advice can be offered: this is the second day in a row that my iphone 4 has crashed while i was on a call. without warning the display goes black and neither the refresh button nor the power button will bring it back to life. i held both buttons down simultaneously and that rectified the problem for one day, but now the phone is not responding to any measure. fully charged battery. any advice???

basics from the manual are restart, reset, restore (first from backup, then as NEW).  Have these been tried?

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