Also having problems with clamps breaking lately. Two went in a few days. Seems to happen on the innermost notch. The groove on the innermost notch is smaller, and sometimes it can slip off and when it does it moves fast speed to next notch and breaks off. Think that’s how it happens. Or perhaps since the notch is smaller, there are greater forces on the outer part of the part that connects.
So, solution might be to not use the innermost notch.