you'll want to open a TAC case - whenever there's a failsafe event, Unity will write one or more errors to the application event log that'll have more details about what triggered the error - it's impossible to speculate without at least that to go on.
right off the bat though and Jeff you taught me this a long long time ago.
check the opening greeting callhandler owner and message recipient to make sure they are valid.
rlp
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