After a normal round in vanilla this always happens is this intentional or a bug?

I don't think it's intended, because it's just like you stay on previous map screen.

After the restart the game is not playable anymore in one room for more than 10 minutes. There are problems with logging into the game and what not.

Not sure if this is the only case or not, but spawning a shaman object at the last peak of the round causes this bug.

There were several bugs with vanilla maps. A client sided patch has been released in which this bug should be fixed. You will need to relog for this to take effect for you. Please post back if this does not solve the problem.