Another problem that can make the spritzers stop spraying, is the belt area getting wet from the spritzer. when you have the spritzer spraying the most inner wheel of the left hand side, the water gets sprayed on the belt. I think if the best is loose at all, it then causes a problem and slips and won't pressurize the water line to spray. I believe Mike pointed this out to me one time. I got some tin foil and formed a shield that i now cover my belt area with. This fixed my problem with the spritzer stopping. You can tell if this is the problem by seeing if the spritzer only stops when it is spraying the inner wheel and the belt area. Of course, it could also be that the compressor system needs maintenance which is quite simple.
Mark