DO NOT turn the dial to relax the strap after use. Pull up the strap and remove the headset without turning the dial and remove your headset from your head, then you can loosen the strap with the dial without any cracking or slideing. Even if the headset is tight on your head, you will notice that you can remove the headset without loosening the dial. This also happend to me, so just turn the dial to its extreams back and forth a few times and try again on your head tightnig slowly and it usually fixes itself. But to avoid this in future take of the headsset before loosening the dial.
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