The slots on the hard hat for the ear protection easily break-off if you don't remember to properly rotate them down from the ears up position, the only recourse is to buy a new hard hat. Definitely a design flaw, but thats the way it goes when everything now is made only of plastic and no metal parts to offer strength in needed areas of the hard hat.
Currently purchasing new helmet, tab for holding screen and ear protection fractured 2 days after received it. Tried to glue it etc. Only solution buy a new helmet. Hopefully it was just a fluke but from other posting, concern it is a design flaw.