A while back I started having issues with the shifter sticking and not allowing me to downshift past 3rd gear. The solution is to nudge it up (not too much or it shifts back up) and then it will go down one gear, reapeat to get to first. This is dangerous and annoying on sharp corners followed by steep hills (like near here) where I've slowed for the corner but can't downshift to 2nd and can't let the clutch all the way out while in third or it'll stall.
I've noticed this happens more frequently at colder tempuratures, it's currently 40°F here. The bike had been running for over 45 minutes in stop and go traffic to get here, so the oil should have been warm regardless of outside temp.
Before I take it to the stealer, anyone got any suggestions or possible causes?