I find that in some injectors the ball stick in the o-ring. I have to open the gun and push the ball with a pointy object. Usually the first part of the day and that's it. I find they will stick when I use the bypass valve. It's like the pressure just hammers the ball into the o-ring.
I put a three bar on my steel eagle for pressure washing concrete. At the same time I did this my nozzles started clogging even though I increased the size. Recently I cleaned out the coils in my heater and I found this: