game aborted when arena time runs out

That happens all the time near the end of an arena. If there's just about a minute left, then if your opponent is is a worse position they should be able to continue the game for the remaining time to abort it. Now if someone just blunders right away and waits like 10 minutes for the game to abort, that's a violation of Chess.com's Sportsmanship Policy. I know it can be annoying, but it's just what happens when you play games towards the end of an arena.