I thought it was my computer/ISP but I seem to be getting a lot of lag (sometimes when I start a dungeon the game will slow to a crawl and be like watching still frames, it used to work fine on the exact same laptop/connection) and I get disconnected with a 90k error a lot too, it's completely random, sometimes I can play for hours, other times I'll get it ever few minutes

I'm on Virgin Media in the UK