These guns jambed from day one when they where brand new...we have always used Fletcher brand points. Perhaps some of them have been manufactured out of spec.
First, it is not typical to have jamming problems with the Fletcher point drivers. I have two black ones (FrameMaster), a green one (FlexiMaster), and a yellow one (MultiMaster). All of them have functioned perfectly for at least ten years, since long before I became a Fletcher consultant.
The only problem was when I received defective points -- twice in twenty years. When the jamming started the first time, I thought it was a problem with the tool, since it was already several years old. So, I bought a new tool and had the same problem right away. That's when I found out about the defective points. (And that's why I have two black point drivers, but the second one comes in handy now and again.)
As soon as I stopped putting defective points in the tools, everything was good; no more jamming.
Defective points have cropped up a few times, and it could happen again some day. In any case, Fletcher distributors will gladly exchange the defective points, and Fletcher will take care of the distributor.
A word of caution: If a distributor has sent you a box of defective points, then he may have a
whole shipment of defective points, and his replacement points might also be defective. So, I suggest buying a box of points from another supplier, which would probably be from a different batch. Doing that may help isolate and identify the problem. As far as I know, defective points are not visually distinguishable -- they all look alike.
Aside from defective points, wear (lack of lubrication) could make the tools jam after a few years of use. If kept clean and lubricated, a Fletcher point driver should provide years of trouble-free service, even if a high-production shop.
If you had problems with the tools when they were new, then maybe the tools were defective. Again, if a distributor had one, maybe he had several defective tools. You might have been able to exchange them for replacements through your distributor. Or, if you received defective points with the new tools, the jamming should have stopped when you opened a new box of points.