Since the last patch I have been getting crashes at some round ends, funny thing is tho it's normally at the same time as 2 or 3 other guys so maybe serverside issues.
I find it depends a lot on the server - some I will get the black screen with loading bars at the end of the round until I task kill it (or an outright crash) and notice the server population has plummeted so assume a lot of other people had the same. Other servers I can play 5+ maps before I see it if at all.
On a related note they seriously need to add a quit or exit command to the console (why does it not have one?!?!) as you can still access the console when it locks up like that usually but instead have to force kill the task :|