See bug #1866 and also this thread for a possible workaround, unfortunately the person who raised the bug (hybrid) has dropped off the face of the earth which has rendered the bug report mostly worthless as Nokia will be unable to progress a solution without the input they are seeking.

Fortunately the bug contains enough useful info to possibly help others, but may not lead to a permanent fix (yes, this situation really annoyed me as it's one of the few occasions where Nokia used Bugzilla the way it should be used, only for the community to fck it up and no longer provide any input when prompted! Arghhhh!!)

If this same QoS workaround works for you, it would be really good for everyone else if you could provide feedback to Nokia via Bugzilla bug #1866!