Okay so I had my first arena DC and when I logged back on, I can't select the marni server I was on for the match so I have ZERO way to actually connect back to the arena to avoid a leaver's penalty.  No matter how fun the game is, with the amount that this game crashes and DCs, if there is no way to avoid a leavers penalty from a DC, than, yeah this is gonna be a dead content for me moving forwards.  

you simply just log back into any server... when you join you'll have a prompt asking if you want to go back into the arena if the match is still going. The only problem is you'll more than likely rejoin the match dead on the floor and unable to participate in the round even if you reconnected back in time before the round starts.

I wasn't given a choice to go back in at all is the issue.  I suspect because the match might have ended...but they need a grace period after you DC where if you log back in, you don't get the leaver penalty.  Like say if you come back within 1 min.