They break just at the point where the 2 upper ears meet the solid body.
The 2 ears (Sides) crack through from the rear to the front.
If one breaks, you know it. You will be shut down until you have a new one.
I will see about getting a pic of one tomorrow. I have 1 that has started to crack, all the rest went to the scrap yard.
We have been busy at the shop so I haven't had time to take a pic, load it and upload it.
People who have had the issue know what it is, and if yours breaks, you will know