This is an issue which sql 2012 often seems to throw when it is trying to catch up with operator script actions. It requires you to run the same command again to achieve the required task. Unfortunately this is another downtime feature of the latest MS product.
the full error
"Msg 233, Level 20, State 0, Line 0
A transport-level error has occurred when sending the request to the server. (provider: Shared Memory Provider, error: 0 - No process is on the other end of the pipe.)"