Go to groups.google.com
and sign in

now click on any of the groups your subscribed or joined! you might have logged in and you can see your email address and info like below
yournamegmail.com | My Groups | Help | My Account | Sign out

now click on another group name , the above link turns like this
   Groups Home | Help | Sign in

although you have already signed in with Remember me on this computer. option too checked in.

i face this problem only this time!

does any one have this prob ?

No problem in my case