My buddy's 2007 420 is electric shift. I've heard other people say that when they shift, sometimes it will lock into whatever gear they are in and where the indicatior says what gear you are in (1, 2, etc.) it will be a (-). Then you have to shut it off, rock it back and forth and it will shift again. Well, my friends is doing this and is getting progressively worse (doing it more often). He's already replaced the angle sensor. Is there anything else that would be wrong besides the shift motor?