There have been a few other reports of this, but I'm not sure that a cause has ever been positively identified. Please submit a bug report with logs from the affected machine(s).
See -
How to Submit Bugs and Live Mesh Logs
Note that you may not receive a response to the bug report, though. It will be transferred to the internal system to be assigned to the appropriate development group.
-steve
~ Microsoft MVP Windows Live ~ Windows Live OneCare| Live Mesh|MS Security Essentials Forums Moderator ~