Just a simple question.... did you try to reflash your complete box to be sure that everything is clean? Just because we do not receive any other reports on this issue (except for VUs).
Yes, I´ve reflashed the box after I changed the drivers. Just to be sure I have the "original" image.
Made a rollback to dreambox-dvb-modules_3.2-dm800se-20120711-r7.0_dm800se.ipk and now everything seems to work again so its probably driver modules as you said.