Long time since I have looked at one of these so cannot remember the layout and I could be way of the mark here
But had a similar problem with a 1999 V6 Laguna Auto quite a few years back, it would randomly bring up the gearbox light and bong, go into limp, when you restarted it was fine again for a week or so
Long story but the outcome was that it had been into Renault for full service, they replaced the plugs with Renault plugs (reboxed NGK's) not their own brand any more. It clearly stated on the slam panel a Bosch Plug. We changed them for the correct Bosch and the problem resolved, never happened again, the dodgy NGK's had randomly spiked the ECU mounted on the engine.......just a thought
Peter
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