After constantly erratic performance, I'm getting pretty frustrated with this and would at least like to get to the bottom of the cause. Firstly, PS3 system. Though I'm not sure how much of a factor that is.
Now most of the time the game runs fine enough, but every few weeks I seem to get stuck with some issues that make the game pretty much unplayable. Client goes fine, title screen goes fine...then I get into the game. If I'm lucky, rubber banding. Usually though, people are frozen and friend/FC lists don't load - as though you lost connection - this lasts from...30 seconds to a minute before the game gives up and gives me the 90k error message. I get sent back to title screen, log in again, same thing happens every time. Although chat channels will still update, I can read and type in FC chat and I will be seen. Also, I am still connected to the internet on other device such as my laptop, but that should be obvious considering I can log right back in after getting booted.
It seems pretty stable if I stay in an inn room, but occasionally even then it will lag in updating player lists. I should add my connection signal is usually good-excellent.
Sometimes when it strikes, it will lay off for a few hours. For example the night before last the game was unplayable, but yesterday I was able to do coil before it struck again. Another "lesser" side effect sometimes is that I can play somewhat normally, but in dungeons player and enemy locations don't update. So on my screen my tank will be chilling in one of the previous rooms when he's actually in front of me taking hits, but I can't heal him because my skills are "redded" out as though he's too far away. Sometimes a model isn't even there so they're completely untargetable. In coil turn 1 yesterday as an example, on one attempt that should have been successful, the second snake remained in the center of the room on my screen, and I could do nothing. If I try and attack where it appears for me the skills won't register. If I move to where I know it is, I could hit it with untargeted AoE but nothing else. That was an embarrassing one.
As I understand it, throttling would be a constant thing if that was the issue, so I'm doubtful if that's the cause, though I have to admit I don't really know how it functions exactly. Both most severe occasions have been towards the end of the month, but I've been well within my 40gb per month usage (to be honest I'd be rid of the cap altogether, but I that's out of my hands).
On some occasions I've had errors on signing in to PSN when this has happened. While it would be easy to assume that this is the case, other times when I suffer this problem I've had trouble connecting to PSN, but infrequently. So I wouldn't know if PSN was the problem or if that was just another side effect of whatever the problem is.
The symptoms imply connectivity issues...I think. But then why sometimes is it fine when I've changed nothing? It's like it even when nobody else on our broadband connection is downloading or anything. A week or so later it'll go back to being okay.