Ok i think we were in the same party and would like comment with details with this that happened to me when trading and 1 other person on the run. Later did a run with my other char and we had same disconnecting issue with the person holding the hammer in inventory, trying to trade the hammer and instantly getting dc resulting in failed run. And i have never experienced dc in APQ before and now after server check this happened to me and total 2 other people on my runs so theres def a issue after the server check.
This happened during just one of my runs today, except the party leader was the one immediately disconnected
Commenting to confirm that this happened to my party as well. Until fix, I think dropping the hammer will work fine for transferring the hammer to leader.
I believe this was related to the same issue affecting stores, could you try to check to see if the issue seems fixed now?