limited eq?Follow

well it might just be my computer but every like 2hours and 30 mins ive been on eq it starts to get laggy.. then before 4th hour i get disconnected. now i play diablo 2 also .. and i can stay on that over well ive only been on it up to like 8 hours at a time but it can stay onlind that long .... why do i get d/q from everquest everytime at the same time?