I have a 2018 with 2K miles. Riding back from work yesterday and downshifting the gearshift lever would intermittently not budge, upshifting not a problem. Looking at it last evening it seems that the return movement when downshifting worked sometimes, sometimes not, no problem advancing upwards through the gears with the heel shifter. The linkage looks to be intact - no excessive play, shift levers not making contact anywhere that I could discern. Am I missing something obvious? Is there a lube point that needs attention?