S7 problem

[h0cusp0cus]

I upgraded my S7 from 2.1 to 2.2 and it ran with no problems until...after a few weeks it will not boot up past the splash screen. I have tried holding volume and power buttons for fastboot and running the upgrade again. The upgrade runs fine [twice] says ok but it won't go past the splash screen except...it did one or twice but then just crashes and restarts to the stuck splash screen.
Any assistance please.