I was banned once ages ago on our Multiplay server. I put this down to a high ping. And the ban ended after the map was finished. As with all bans on Multiplay and i3d servers bans only last for the map they were incurred on.
In your video it happens while connecting and says kicked not banned. Suggests it was a kick due to ping and a temp ban that happens when kicked due to ping. Would be interesting to open console if it happens again or have a ping meter open on your screen.
But as it happens while first joining I would say it would be that you have a ping limit set and while connecting and the connection is settling down you may exceed the limit although if thats the case then the kick message should state ping limit exceeded but would still suggest that could be whats happening here.