This is specific to certain types of mechanical switches. The G&Gs in particular are quite bad according to Ben, and I can make a pretty accurate guess as to what the inside of the switch looks like by his description of the issue, but there are others. The sad part is the design might not even necessarily be the issue, but the materials used inside the switch. Nearly all aftermarket Electronic Trigger Units (ETUs) use a more reliable design. As long as the name is reputable, you pretty much don't have to worry about. The Gate Titan, Gate Aster, and Leviathan Optical use optical sensors that are virtually indestructible in normal usage because there is no mechanical wear occurring between the two elements. The trigger simply floats above the sensors, which shine a light at the trigger and determine its position based on the amplitude with which the light returns to the sensors. Wherever the trigger is, the light will shine back more intense because it is close than the other wall of the gearbox shell. The Perun Hybrid uses a magnetic trigger sensor that works quite well and is a good budget option for replacing a less than spectacular trigger unit. Note the difference between a MOSFET and an ETU. ETU refers to something that replaces standard trigger contacts and can have many programmable features. A MOSFET is specifically a single component that typically exists on those circuit boards, or can be a standalone unit, that directs the high current electrical flow to the motor only. High current is not necessary to run the other components on the board, and in fact, would damage them. The main reason high current can damage trigger contacts though is because the electrical "pressure" is so high that it is ready to jump before the contacts actually make contact with each other, causing an arc through the air that will burn up the surface of the contacts with each activation.