I doubt if your 6700 is going bad. They have alot of problems with WMDC and there is a whole Windows Mobile Forum about it:
http://forums.microsoft.com/WindowsM...1762&SiteID=65
You may want to pose the problem to them but their standard answer is usually delete partnerships, hard reset device, and try, try, again.
Is this with BT or USB or both? I've always read that the ROM flashing is more reliable with an XP machine running AS 4.5. Do you have one available for use?