although i have never seen the disconnect bug, i have been reading about it. my guess is that its related to being afk.. sort of. since you were alt-tabbing before, you were constantly pushing keys into that clone. (just tabbing into the clone pushing events to the window)

does it normally happen on a long run where you are not passing any keys to the clones... they are just in follow mode?

if so.. try 'poking' them once in a while, like every 30 seconds or so while running. just hit some key thats not on the do-not-pass list, maybe a movement key or something.

let us know what happens.