 NeoCem007ServiceUser we see in the log is used by internal processes, such as CBR backup. There were bugs that caused multiple CBR jobs instead of one, and this would attribute to multiple logins you see in the log and this issue has been fixed in MR3 (2.3.1.x.x.x).    This is not related to the SP reboots, for the SP reboots please open a case with EMC Support to find the exact cause for the reboot.  
I am seeing a user   NeoCem007ServiceUser logged into our VNXe SP's and while I believe this is a EMC internal account it is becoming an issue as this interal account has decided to pull service info from the storage processors and then reboot them at random times....has anybody else seen this?  William
Seeing LocalInternal user logged into SP's