Hi guys.
It's a relatively common problem with the DPO auto gearbox.
It's not, as mentioned the worst manufacturing in Renault as the box is shared with Citroen, Peugeot and a few Korean cars under different names.
Take the car to a garage that can diagnose the ECU fault codes. Our son's 2003 Clio auto had the same problem. It's a solenoid/pressure regulator in the transmission. A couple of hours labor to change and the part isn't too dear. 2 months out and the Clio here is perfect and drives so much better.
The problem was only there until the car was warmed up too.
Hope this helps.
PM me for further details if needed.
P.S....didn't read all of xerion's post, sorry. Yep, that's exactly correct. Peugeot and Citroen have the same issues. I spoke to the owner of Cobra Trans and he told me the boxes are good and it's all down to maintainence in the end.
I personally recommend 60,000km transmission oil changes too.