Need For Speed Most Wanted Online unlocks problems

Hey guys, recently ive been playing with a friend on PC on origin we create a friends game and play both of us we unlock paintjobs, and performance upgrades but in the next day when we came back we need to unlock them again thats not normal, can you help me? btw we have the premium modification unlock soo we just have to unlock the paintjobs but when we do unlock them in the next day we play again the paintjob is gone and we need to unlock again ^^