After doing some heavy looking through the forums, I wasn't able to find my particular problem.

When I am casting, and need to move, I just move out of the way. This means auto-stop for casting should kick in. About 20-30% of the time, my game simply throws a 9000 error. This happens a lot on my BLM in particular, as I am trying to level him, and requires a lot of stop casting to move. I leveled a PLD to 50, and did not experience any D/C errors, unless I tried to mount, and moved before it was done casting.

Additionally, I will get a 9000 error when I am about to die. Instead of seeing my character die, instead I get a 9000 error. It is driving me insane.

I'm not sure if there is anything that I can do, but it seems no one else has really complained about this issue, so I am thinking it might be more localized to my PC. Any suggestions?