We have an automatic 2023 Benimar motorhome on a Fiat Ducato base. On 5 or 6 occasions when starting the engine from cold, the automatic handbrake only releases for a second or two before re-engaging. Pushing the button releases the handbrake but still only for a second or two. Sometimes it clears after a dozen or so attempts. Sometimes it clears if you hold the handbrake button for a period. Turning the engine off and restarting it does not make any difference. Yesterday I couldn't get the handbrake off after numerous attempts, but the fault cleared overnight. The main dealer has been unable to find fault so far. Has anybody any suggestions? Thanks