I don't think its a Server issue I have observed the fact you are running the same version (Powered by vBulletin® Version 3.8.4)
http://forums.iboats.com/forumdisplay.php?f=24 this site is also showing the exact issues seen and experience here.
Maybe an upgrade to version 4.0.3 will fix the bugs per there web site? If there is anything I can do to help let me know ..