[jackstraw]

If you have an updated ROM using Kitchen or other Roms, Then I have run into this problem before. This is Definetly a software issue. You need to hard reset or try a different combination of Rom and Screen locking program. It always in my case was sus2 or device lock that was my culprit. Sometimes it banged heads when I used a different dialer. there are other calanders out there as well. but my suspicions lie with a program clash. You should tell us if your modified the ROM at all and what proggys you use.