My friend just had the same issues in his Honda. It wasn't a disengagement issue his tranny took a dump on him. He's extremely hard on it and ended up destroying 2nd gear. The guy he took it to a shop and they put new gears and supposedly put new syncros in it gave it back and it still had the original issue. The mechanic then thought it was the shift fork so he pulled it again and replaced it and still didn't fix it. He ended up replacing everything in the tranny. I don't have a whole lot of insite on it but that's all I know. Was just trying to break it down to make it easier for someone who might know what your issue is.