Yesterday when I was playing paintball, my trigger got stuck in the forward position. It reminded me of what it feels like when an actuation point set screw binds against the edge of the microswitch on other guns. I know that the alien actuation point is a fixed spot on the trigger, so that couldn't be the cause (brilliant idea, by the way. I've seen a few broken microswitches in my day that suffered from that problem). It started happening right after I pointed my gun upwards against the deadbox before the game started. After shaking my gun around and pointing it in every which way, it unstuck itself and I was able to shoot again.
I think I've figured out what happened. I removed the trigger frame, and took off the trigger stop plate (I had never removed it before). I noticed a screw resting above the microswitch box. I couldn't see any purpose for it. It was just chillin there. Shootin the breeze. So then I was like "wtf mate?" until I realized that it was one of the phillips head screws that holds down the stop plate. Until then I always thought that there was only one screw used to do that, and I had to check the manual to confirm that the vagabond screw was in fact meant to be holding down the stop plate. I think that what happened was that that screw has been there the entire time I've owned my gun, and happened to fall infront of the micro switch and cause the binding. I removed and inspected the switch, and it doesn't seem to have caused any damage fortunately.
I suggest that everyone check their Aliens to make sure that both of the screws are intact where they belong. AlienPb seems to have spectacular quality control in most respects, but its better safe than sorry. Maybe it could have vibrated loose? I doubt it, but I'd check it periodically to make sure.