Cant move Items in stash & traders are taking decades to load

Hello. Sometimes, arround every 2 minutes i am not be able to move the items in my stash and also the traders and the flea market dosent load. Then after arround 1-2 minutes again, it works. But this makes the game unplayable and i dont know where the problem is. I also noticed that everytime this happens, i have a very bad internet connection at this time.

I hope soomebody can help