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Did you do any mods, like flashing a different clock or font? That can cause problems if incompatible with your system. Are you rooted? If so, boot to clockwork recovery and wipe cache and dalvik. Then reboot and see if you still have the problem. If not rooted, you can still power off, boot into stock recovery and try wiping cache.
I have same problem and would like to try this fix, but don't want to lose my calendar data. is there a way to do this without losing my calendar?
So, how do I clear data of my calendar storage?