Has anyone else had an issue with the new Schuberth C5 helmet in which the visor will not stay open? On my C4 it was possible to keep the visor slightly open for ventilation at the first "detent" of the ratcheting mechanism in the hinges. On the C5, the visor just flops down when I get to 20 mph. Curious if anyone else has experienced this, and if so, were able to adjust or modify the hinges. Thanks in advance.