When using the anthanor to upgrade a item the game immedetly disconnects he usser from the server. Iv attempted this several times and it happens consistantly every time. So yes, its highly repeatable.
Steps are simple and straigth forward. Load up game, go to anthanor, seclect a item to upgraded, attempt to upgrade it, Disconnect from server.
I havent tested firearms, only melee weapons. So start there, Also dont use the amulet as that crashes the game at the moment, (seprate report in technical issues) Il see if it also happens with firearms. If I havent updated this then it indicates that it also effects that.