IChat often freezing up after a few minutes; force-quit required to sign-on

My iChats are very often (almost always) crashing after a few minutes- the screen starts to freeze up on both ends, the audio remains, and I have to force-quit and re-start iChat. Strangely, sometimes the iChat will work fine for an hour or two continuously; but usually once it goes into "crash mode", all of the chats will last for a couple of minutes and then begin to erode. This seems to have become much more prevalent with the introduction of "mobil me"; I never had many consistent problems before. This is a persistent problem with iChat with me using my .mac account, video-conferencing with a fellow .mac subscriber.

Have you installed this Quicktime update.
http://www.apple.com/downloads/macosx/apple/application_updates/compatibilityupd ateforquicktime.html

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