DCing when pressing trade?

Been happening since chaos patch as far as I know everytime you trade over 4 or maybe 5 items.

I did a half hour ore transfer with one of my friends, this is not the problem. The problem is one that was fixed before but is happening again. If you have x slots, are receiving more than x items, and you're trading away y items so that you have x slots to accept the trade the person who would only have enough slots after the trade DCs.