I have had the same issue and now all of a sudden my 3rd gear has the issue and it's worse. But it's a hit or miss on the 3rd gear. 5th gear is all the time. Also when I go into 1st gear I will hear a clunk noise (not all the time 1-2 times out of 10 it'll happen). I did take it to the dealer and they changed my clutch, gear oil, bearing release and radial bearing. Issue wasn't completely gone but much better. Now after 6 months the symptoms are back again. I'm hoping the gear oil change will help.
I did hear the gear oil helps. Look at number 2
http://blog.modbargains.com/6-mods-t...-your_fr-sbrz/