P.s. Why would you install Windows 10 on a server? Stick something proper on it... 2008 R2 or better yet Linux!
^^ I've pretty much stopped doing Windows update on 7 (silly MS) due to the way they keep trying to creep the notification into "critical" updates :S
I can't say i have had any problems with windows 10 so far....updates worked fine on PC and laptop and brix...maybe some software issues in your systems...try to get those updated prior to any updates?