I installed Symantec Endpoint 11.0 on April 16th. ever since the install, several times per day I am getting event 11 arcsas errors in the system log. During these times, my server hangs for just a few seconds and my users will get kicked out of the applications this server hosts. The server is and HP AiO 400 (1 TB) running Storage Server 2003.
I updated to the latest RAID controller driver from Adaptec and have applied all of the patches and service release files from HP. Seems to really be an issue with the AV software. Worked fine with Symantec 10.x