Mini Cooper One

long nct - 09/2027 last owner done recently I’ve only had it about 2 weeks , previous owner had breaks done and service done Issues- drives perfectly fine when moving at speed but engine tends to cut off when stopped for periods of time , honestly have no idea what it is , it wasn’t happening when I was doing checks to buy the car. Key doesn’t seem to work to open the car. Not even key fob. Was working previously and came out to try get pics of the car now it won’t open. No other problems the car is perfect when it’s moving at speed it won’t cut out just at a standstill it cuts out and I’m not sure as to what it is. Would suggest trailering it away. Any problems just message