I'm no pro when it comes to the technical stuff, however I am overly confident that the character you use is not related to your disconnection rate. However, one thing I can think of that you can try is to check your graphic settings in game. Does your psy have the textures and quality on high? Where your cleric has everything on low? If this is the case, your cleric will run smoother and is less likely to disconnect. Perhaps your computer is trying to run the game on settings it is not capable of handling and as such is not responding then its kicking you out.This may or may not be the problem but it's always worth a check. Either way I can promise you it's nothing to do with the character you are using.