I had something similar happen a very long time ago when I still new to driving a manual Z. I would put in gear, But not fully in the "slot" and the tranny would spit it back out. Maybe your not putting the shifter fully in gear it was reacting the same way it happened to me by kicking it out. Hasn't happened since then, I've noticed that you need to revmatch even when up shifting or the gear wont go in. So letting the revs drop back down before you try to engage the gear.
Just a thought, I know its a long shot, but couldnt hurt to share my experience.
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