Dont know about the Renault but the Actros tractor units used to do it quite often.
The way to get them down was to disconnect one of the plugs onto one of the rear crucifix sensors on the chassis,turn off the ignition then back on,Because the suspension ECU “saw” a fault(no signal from sensor) it reset itself to default which is back to standard ride height.Then you reconnected the plug and the suspension was fine.Usually happened when the tractor was pulled out from under a trailer too quick.The air bags didnt get time to deflate through the suspension control valve and pushed the crucifix sensors over their parameter limits and they locked out.The ECU cant accept a signal outside its parameters but if you fool it into thinking its got a fault it resets its self to the default.Hope this helps.