When I tried to use my bomb by presssing my bomb in shortkey repeatly, Sometimes my craftsman will be stuck (cannot press any skill or press any left or right mouse botton but can press potion from shortkey). Luckily, it still can be pressed Esc to go back "To Menu" icon to prevent mobs from killing me.

The other is when I tried to drag item from guild storage to my inventory.
As I drag and try to put it on expansion slot, It send some error message at first time.
when I try to drag and put item on expansion slot again, it send message "Disconnected from Server", then I put "O" botton and game closed.