in this week when KAV 6.0.3.837 for file server update i had to restart my server. 3 times in this week.
I have 5 server in this office & and restart them 3 times in a week is a Series problem.
what am I doing?

I've noticed a lot of reboots required for updates period, not just for servers. I don't think you are doing anything wrong--this seems to be by design.

However, the frequent reboots are highly annoying. I'm a convert from Symantec's corporate AV software and while I don't necessarily miss it, I did like the fact that it would install updates and restart its services seamlessly for the most part.