Um. I might have messed this up but-

To start with, unchecking and rechecking the Javascript and cookies options in the web browser, as well as going through the Date & Time steps appears to work- if with some small lag. However, on going to a Hunt with a whole heap of people around, I experienced significant lag and errored out of the game again. I was able to get back in at that point, but experienced further errors and lag in the Labyrinth of the Ancients.

I've tried resetting these settings again- going to the opposites where I can, and swapping for Date & Time being where I'm particularly worried about having messed up, but that doesn't seem to have made a difference now. I have tried the Port Ranges, but I'm not entirely sure I understood what happens there- would you have any advice on this? Wiring up is going to be pretty awkward due to the setup at home, so I don't know if I can provide feedback there.

I do have a couple of other concerns- I used the PS3 to PS4 upgrade; would this have had any affect here in any way? If this is related to Date & Time, is it likely to occur again between daylight/non-daylight savings periods?

Thank you for your time.