Hello. I have purchased a fiat MULTIPLA and I’m having a problem with the indicator. Occasionally maybe once a day when I try and put indicator in at junction/roundabout the stalk will not lock in and activate the lights it keeps cancelling. I then have to try and shift the stalk several times before it will lock in. I have taken it to garage who don’t know what to do as it is intermittent. Is there a part or something that needs replacing. Please please help