Event_log logs the following:
Notice: Invalid shared memory key or size [sp_cop(shs)/<pid>]
A shareplex instance tried to use a hung shared memory segment.
This notice can be ignore since shareplex was able to acquire a new shared memory segment and to prevent this message to log into the event_log in the future please perform the followings:
1) Shutdown shareplex
2) Remove shared semory - refer to solution SOL6011 (Removing Shared Memory From The Operating System)
3) Restart shareplex