Noticed the wife's copen is getting quite hard to change gear at times. Clutch is operating well, but the gearbox feels stiff. There is a bit of slop on the linkages at the gearbox end but i'm assuming thats normal and in any case would have a different symptom, (more like stirring soup looking for a gear, and that's not the case here). The gear action and selection is fine, just very stiff to actually move the lever. I've changed the gearbox oil without any improvement, but tbh the old oil looked fairly clean and was at the correct level. Car is a 1.3 done about 50k miles. Any ideas?