2017 Dacia Sandero clutch judder

Strange if it's intermittent , hard to determine when that happens .Usually clutch assembly worn but if so is always consistent and not coming and going like you say

yes I have a 2017 stepway with the same problem

Just bought a used 2019 Sandero 1.0 Sce and after 1 week clutch suddenly started to judder in 1st and that lasted 3 days and just as suddenly disappeared. I thought it might be an oil leak after standing on a sales forecourt for a while but that would not suddenly go away.

Now wondering if it could be an ESC (electronic stability control) issue, applying brakes or messing with throttle when not required? Just a guess as I am not a mechanic.

I would expect the ESC warning light to come on and a stored fault code if that was the case