when i play now (5 box) i get dc on one of my characters from time to time happends about 5-7 times in one single BF run and that is like 40 mins or so.

it is not always the same character what can it be ?

edit: it's only when i Dualbox i tryed playing normal for several hours without any beak point and i havent had this problem 1-60 its now after that it has started from about lvl 62 to (now 64)