Today, when I stopped at traffic lights, gears shifted down normally but when I stopped it started to make clunking noises. Clunking stopped when I selected N. But then I couldn't select 1st. It just started making clunk sounds again every 1 to 2 seconds, with a little jolt that I could feel. Only two years and less than 20000 km since last clutch was replaced due to collapsed tangs on the pressure plate. It had mild variable clutch judder on pulling away from stationary for ages beginning not long after clutch was done; only evident when pulling away slowly. Not when taking off briskly. Any thoughts on diagnosis? I'm fearing another >$5000 bill.