Two servers are alternatively coming on console of SEPM 12.1

Hi,

We have SEPM 12.1 on windows 2008 server.Everything is fine with all the SEP clients except two clients(client01 and client02) running on Windows 2008 servers.

When one client is displayed online on manager console, other one is missing and vice versa.These two client appear alternatively on manager console. Both have different IP addresses and both are upadating properly. Client02 full scan date is showing as March 4, 2013 which is very old date and also not as per scan policy.

Could you please help us to know the reason behind it?