2006 Renault Clio non starter

First problems started when car was in warranty. It would drive fine then I'd drive 3 hrs to work and find at the end of the day it just wouldn't start. AA would restart it would go to renault and then be ok for a few weeks then the same problem. The problem seemed to be fixed after 1 year of arguing with garage and getting Renault UK involved. Just recently the car fully opens the boot everytime I unlock the car today the car and it won't start at all, there's nothing, no lights on the dashboard just car is locking and unlocking repeatedly, even without the key in the ignition. The button in the car for locking is flashing and clicking repeatedly again even without the key in it. The key fob battery has been replaced and it is serviced regularly. It has just passed an MOT. I'm at a loss with this and no one seems to be able to solve the problem.