The volume wheel is not tight to the rest of the chassis. It rattles. It has play in it--more than one would reasonably find acceptable. You can push and pull the volume wheel gently in place and it moves around and rattles. If you shake the entire unit itself, it rattles.
This is something that has been discussed on Henrik's (BOTF) channel in two videos recently. It has also been the topic of discussion on BeoTalk (Mikipedia) across the last 2, maybe 4 episodes. Apparently, a number of Halo examples are affected so we thought it would be helpful to attempt to quantify that more clearly.
Again, if your Halo is affected, please submit a Hardware inquiry to B&O through the app and also respond to this thread with the information stated in the first post. It would be helpful, I hope.
Cheers!