I’ve been locked out of my 2015 Model S five times now. First time 18 months ago, fortunately in the club carpark. No mobile connection either. Cleared after 2 hours. Same in July, same place. Tesla Support couldn’t access the car either. Now it’s occurred 3 more times, twice at the same place, but with a mobile connection and once in several places in town and on return home. These times the App worked for access, but I got a Key Not Detected warning trying to drive. Fortunately the App Start function worked. The batteries in the keyfobs are good/new. We checked with a RF scanning receiver. There was no interference on 433.955MHz and the keyfobs gave a good signal. I've just collected the car from Tesla Service. They can’t find anything wrong. This is an intermittent fault and if there is no mobile connection the car is completely immobilised. I've seen mention of problems due to the 12V battery ion other forums. Service say it doesn't appear to be an issue here. The battery was replaced a year ago anyway and since the App works normally it seems unlikely to be a battery problem. TeslaFi has been flagged up by Service as a possible cause of interference, but I turned logging off and still had a recurrence of the problem, which always seems to clear itself after an hour for so. Has anyone else had anything like this?