I have had this same issue I finally got things resolved today. The way I fixed this requires MemMaid memory cleaner you can get a trial offer at
MemMaid - Download. Once you have MemMaid installed you need to go to Start/Settings/System/Clock & Alarm and uncheck all the alarms. Next open MemMaid left soft key, jump to Databases/ Notification Que and check all the boxes next to a clock icon including the one that causes a bunch of other boxes to be checked don't worry about the calendar Notifications that get checked they will come back on there own. Now hit delete click yes then ok, now exit MemMaid and soft reset your 800w. (Pull out the battery) Once your 800w is back to the today screen go back to Start/Settings/System/Clock & Alarm and reset your alarms. That should fix your alarm problem.