Sorry to hear thats happened to your nozzle. Managed to somewhat replicate your problem by unscrewing the hex screw fully. If you still have the hex screw it does go back in fine, and mine doesn't seem to loose adjustment. Maybe adding a touch of blue loctite or a wrap of PFTE tape to make the hex screw secure might help, but honestly, given the design, it will make itself loose over time unless you adjust once and leave it. It's a shame your having issues with yours. I'm gonna skirmish it again one more time and see if the problems I had before pop up again, before deciding whether to go back to the stock nozzle + NPAS.
I'm still having hop issues with my MWS, it's really strange, the hop up effect just disappears after a few rounds on the specific setting I need it to hop 0.3g BBs, turn the hop up more to considerably overhop them and the hop up doesn't lose its setting / effect at all.
Worth noting that on the hop up setting where I lose all hop after a few rounds, it doesn't unclick itself or anything, I counted how many clicks it takes me to get there from 0 (10 clicks), fired a few rounds (with a considerable gap inbetween shots) until I lost hop, then counted back the clicks to zero hop, exactly 10.
Took apart both the hop unit and hop adjuster, zero signs of wear, damage or loss of parts. The internal clicking wheel on the hop up adjuster looks pristine. This started occuring after I installed the AngryGun nozzle but now its occuring on the stock nozzle too, checking the gun through the chrono, I'm not losing any FPS outside of standard deviations after firing quite a few rounds even when the hop is gone.
Honestly clueless as to what to do now., might consider getting the AngryGun Adjuster but to be frank I don't think that will solve the issue. I'm using the SixG nub and I am going between the Stock TM bucking and the Modify Tan, both have the exact same issue. Also using BLS 0.3g BBs (non-bio).