Dacia Sandero engine won't start after vehicle checks completed.

Most of the time the car starts with the key just lying on the passenger seat but at most inconvenient times you can bet it won't start. I get the usual vehicle checks completed but the engine refuses to start. Moving the key close to the reader makes no difference. By pure luck i have found there's some sort of sensitivity to the handbrake. Now, i am a 5ft tall woman and by no way am i forceful with the handbrake. The only way to get engine started is releasing the handbrake and let it roll slightly then re-start the car. Extremely annoying as it is only a few months old. Any ideas what's causing this?