One Solution for freezing in Arenas.
I had recently suffered with random lock-ups in Arenas. There didn't seem to be any link to player action or round timing (other than it often happening near the start of the match, yet not always).
A clean boot with default/low game graphics settings seemed to stop the freezes, and I was happy.
I had previously turned CSM shadows off manually in the videoconfig.txt for performance, and noticed they were back on after my reset, so I manually edited the videoconfig.txt file again to turn them off - - - - boom, the Arena freezing was back. Enabled CSM shadows again, and freezes stopped immediately.
So, if you have been locking up in Arenas and have turned off shadows in the videoconfig.txt file, you know what to do.
For EA/Respawn: This can hopefully lead in the right direction to fixing this odd Arena only bug. Seeing as it's not normally configurable, perhaps someone's function depends on it being "1" and manually setting it to "0" causes a check failure or division by zero somehow.