If the autobox is going into linp mode do not drive it as it WILL burn out 3rd gear
It may have a small air leak & when warm as the mixture is weaker than when cold the tick over is unstable.
One tip with a Renault, is check that all the rear lights & brake lights are working properly, no bad earths of flashing or dim lights when they are all tested. faulty rear lights will cause the autobox to go into limp mode & can cause stalling as the brake lights are connected to the engine management.
I have seen so many of these with so many faults caused by corroded light clusters or dodgy bulbs.
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