This is a pretty common problem on the 8100 and you can probably find dozens of threads regarding this in the 8100 section. I've looked through and compiled a bunch of information on this and posted ways to fix this and free up some memory...
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If it doesn't take you right to it, its post #21 in that thread. You could also clear the event log, the steps of which can also be found in the 8100 section
Good luck,
Bob