It happens about once a month to me and I probably shift gears 5000 times a month in the BRZ. If it is my fault, and in truth it probably is, I'm alright with it. It's not like I'm constantly hearing grinding sounds and screwing up my shifting
Edit: Now that I remember I made a similar thread awhile back and some people also seemed to think I was screwing up my shifts alot even though I wrote it rarely happened. But as always, tips and general sharing of knowledge are greatly appreciated.