This issue is being inspected now by a local garage. Thought I would give a greasey mechanic a go. Perhaps, I thought, Renault can only nspect a computer print out...
Yestarday I had the car on a ramp at the garage and looked with them. Nothing obvius - I am now very convinced this is in the gear box itself. I will now pay to have the gear box inspected properly. One suggestion was the clutch plate. Could this move around?? Would explain the sliding clonking sound and crunchy intermittent gear shifts...
What say you all?????
Did the local garage hear the noise you have described, Did they have a test drive in the car.
I feel it would be sufficient evidence to proceed further if a competent engineer would state that they can confirm that the symptoms are there as you have reported to the Dealership you do not want to go stripping or removing parts.