I have a 12 plate Qashqai I’ve only had it a few weeks and love it the other day I put something in the boot closed it as normal started driving and the boot popped open I shut it and a few seconds later it opens again I’ve taken it to a garage and they not sure what is causing it but says it’s more...

I need help my boot keeps opening, I shut it it shuts then just opens by it self I’ve taken it to my local garage and they not sure why does anyone know?