did some research... the strada is a kbc vr3. it uses the same quick release system as my vr2's...

having personally installed those shields wrong myself... i am willing to bet 1 of 2 things happened...

1. when installing it the tiny L shape brakets tha go in the channel, did not snap in... you can double check this by how ez it is for the shield to open and close. too ez, its on wrong...

2. during installation of the shield you broke the L shape brakets... ez to do as i have also done this...

the strada is a nice helmet... i wouldn't give up on it... check to see there is nothing wrong with the quick release mechanism. if it is that should be covered under warr. no brand name is fool proof of defects....