Same problem here. Every indoor ground mission crashes after max 2 fights.
Always the same behavior. My team enters combat. After the first shots the performance decreases like hell and then freeze an/or crash.
The patch reset the graphics settings for most people. Sounds like you two are using ATI cards (since Nvidia users don't seem to have this particular issue)...try disabling Post-Processing or Dynamic Lighting. Getting rid of Dynamic Lighting solved my crash issues in ground combat on my 5770.
nah have dynamic lighting on jsut post processing turned off thats always solved it for me.
Just a shame this problem is back as it was perfect after the mid week patch.
To be fair, it's not like the problem "came back" with the patch. The problem was there all along, the patch just reset the setting that was used to work around the problem. As long as the workaround exists I'm not terribly unhappy, though I'd prefer if they fixed the issue outright. I want my dynamic lighting back. :p