Clio automatic transmission shifting issue

I had a similar issue with my Clio. The symptoms you describe are spot on with what I went through. Check your transmission oil.

What was the oil condition when you had this issue? Was it discolored or contaminated? Any other symptoms?

Yes, in my case, the oil was quite dark and not as viscous as it should have been. I'd recommend a visit to a workshop for a check-up.

I had it inspected at a workshop, and they confirmed the transmission oil was worn out. A flush and replacement fixed the shifting. Total cost was 240€ Thanks!