A855 - 5 Speed

To pop out of gear it says to me something is either out of tolerance or was made to an improper tolerance.

Would this be true if the trans does not pop out 100% of the time?

I know it's impossible to guess accurately, but this is what seems so odd to me.

Sometimes, it goes into 4th and nothing will make it pop out, accelerating, decelerating, clutch in/out, up/down hill, etc.

When I shift to 4th and it's going to pop out, you know it immediately.
It doesn't feel like it didn't go in all the way, you just know, hard to explain.
Holding it in gear, you don't know until you let go.

But, when you know, just watch and wait, sometimes it pops quick, sometimes the stick moves gradually, at different rates, but when it does it's pretty jarring.