A memory leak gradually decreases RAM availability until performance gets so bad, only a reboot will resolve the poor performance. Of course the problem repeats in a nasty cycle until it’s fixed, which Microsoft has just done.
The 722KB file was just released today and is a must download for all Tablet PC owners. All buyers over the next few months, should probably attempt to apply it as well. From the Microsoft site:
A memory leak in Windows XP Tablet PC Edition 2005 causes a gradual decrease in available system memory. This loss in available memory causes degradation in system performance. When this behavior occurs, the user must restart the computer. This problem is caused by a memory leak in the tcserver.exe service.
The patch may be downloaded here.