Running server 2008 ent R2 domain with 2 DC server 2008 and one DC server 2012 ent datacenter all clients windows 8.1 x64. On my physical site I was running 2 subnets 10.10.10.0/24 and 10.10.2.0/24. Things were working fine. Till yesterday any computer attaining IP from subnet 10.10.2.0/24 is really really slow logging in, and the same computer would act accessing the network resources. I also tried to rejoined to domain the computer which already had 10.10.2.0/24 IP, it says the domain does not exist.
-I manually put the IP from subnet 10.10.10.0/24 and restarted the machine things were very well, no lagging while logging on, can access the network resources etc.
-I disabled the scope for 10.10.2.0/24 under superscope of DHCP server and re-added just to make sure the problem goes away, the problem persist while any computer gets the IP from this subnet.
I had no issues before. This problem appeared recently. Could it be the new DC server 2012 doing something odd?