Occasionally, after sitting in neutral (either at a light or enjoying a view) i cannot shift into first gear at all and i have to roll the bike back to get into second and then shift into first. Also, if i'm in 4th or 5th at a stop the bike wont shift at all. I have to walk the bike backward while down shifting to get it to shift. I re adjusted my cable but that didn't seem to help. Any ideas? 2013 DRZ-S, drive line is bone stock. Thanks!