Not connection problems like this. I did have moments where the queue was suuper long but it's not too much of a problem otherwise. Although I know I had this issue when I was using a hard disk rather than an nVME SSD.

These days I did have issues with the server itself where it either ignored my light attacks, mistook every light attack as a heavy attack or flat-out refused to activate skills and then my character would, 2 seconds later, activate all of the skills at the same time.

Mind you I have sub-100 ping...