I bought a 600 bandit a few months back. Apart from not lubing the chain frequently enough (which I am getting into the habit of doing every 250 miles or so) I have not had any major problems. However recently I have noticed that it can be difficult to change gear down when stopping - it will drop down to 3rd, then not budge. I can rock forward and back and snick it down (with a bit of patience), or push it gently up then back down twice however sometimes when riding it just will not budge either wayy at all for a few seconds then drop down/up. Does anybody have any idea what could be causing this? Help much appreciated.