I play free rolls at Carbon & Walker every week. The only problems I have encountered are at Walker. They will often cancel tourney's for some reason. They have made it up to the players by having a larger free roll ( $750 instead of $250 ) This tells
me they are having site/software/hardware difficulties, but Carbon has allways been steady.
I do have connection problems at some sites on occasion, and usually need to reboot the computer, and reconnect. This works 99% of the time.
You might also try closing everything on the computer except the game,
and always go into or start a game with a fresh boot so little else is running in the background.