OK well first of all, and I hate to be a grammar ****, but please make paragraphs. And remember the thing called a spacebar? Yeah, periods like it too. They get lonely when they don't have one.
Secondly, remember that it's the weekend. Lots more people play on the weekend. 4000 people isn't a lot when you compare it to the fact that we used to have well over 6000 on the server. It's come down considerably since then. In fact sometimes there aren't enough people online to put together a decent party. I've had to wait over 4 hours for a party in Qufim the past few days. As a Bard. There were just no tanks or no mages of any kind seeking. Not that there was much to choose from when something useful did show up in the Seeking Party window. I felt bad for the melees that were left behind when a suitable party *was* able to be formed.
Thirdly, it's not surprising in the least that you were kicked in Jeuno. That's already one of the most congested places in the game, and on a weekend it's only worse. That is something SE should address. Since so many people congregate there, they need to either upgrade their servers, or remove the 56k cap there. It's simply not able to handle all the data transferring going on, and some people with lower system specs pay the price.
If anything is SE's fault, it's the 56k cap. True, this makes it fairer to people on dial-up, but if they could keep monster spawns at 56k speeds but leave data transfer uncapped, they should do that. They already do that when you zone into another area, broadband users "Download Data" faster than the rest. Or maybe just make Broadband Only / Dial-up Only servers. Or whatever. But I'll agree that something needs to be done about the awful d/c rates in Jeuno. It can't just be a random happening when so many people have complaints about it.