MG MG3 car will not start, all electrics work fine but not starting. this is the second time this has happened and is now back with the garage.

this car is nothing but trouble. its not a year old and its been back to the garage 5 times. first time for a recall, second and third time was faulty headlights (still faulty and now they are looking at again) then car would not start but managed to jump start so they checked and said nothing wrong. now today wife leaves work and car will not even turn over, lights and power is there but nothing. AA has now taken car back to garage to get it sorted with the lights. i cant seem to see if this is a common fault. Wife says it also has been running a little jerky for the last few weeks but keep getting told "some do feel like that"??