My new 360 is haveing the same issue. Tried the tightening all winding screws. Nope!
I seem to be able to decrease slipping by pushing the crown in further when winding, but this will prematurely wear the "O" rings.
I am going to try different stems I have here.
Regardless of what is posted here,
!. If other crown and stem fixes the problem, the Noob stem may very well have been too short.
2. "DO NOT" Never, Not ever, use super glue. The fumes can leach into the case, and cause all kinds of problems. This is what temp lock tight is for. Stay far, far away from super glue, and anything watch related!!! ;-)
3. Try heating the crown before trying to remove the stem from it. This helps most times.