Has anyone ever experienced the following. You are editing along, not a care in the world--lots of media on the time line, lots of moving stuff around--when all of a sudden--- TEMPORARY FREEZE.  After a couple of seconds to a couple of minutes the program is once again usable (without rebooting or closing through Task Manager--I have Windows XP)  Sometimes this occurs after performing a cut, adding an effect etc (no rhyme or reason.)  I have pretty much configured my computer as per the Knowledge Base but still seem to have the problem.  Any help would be appreciated.