I got this off of the information page about the last patch.
Detailed graphics options will deselect if a system runs at an extremely low frame-rate for more than 10 seconds. A message will display if this occurs.
I was wondering if there was anyway this could be turned into a selectable option. Everytime I get into the Arena my FR are low while everything is loading up..just like they always have been. But now it will deselect all my advanced graphic options. When everything loads up and my frame rates return to normal (60fps) I have to go and turn the advanced options all back on. Not a huge deal as it only takes a few seconds.
Maybe this "10 seconds" wouldn't start until you have been in the arena for 60 seconds, or we could have it as an option to select. I know there are things that are still being worked out and this probably wouldn't be at the top of the list, but its just a thought.