Accuceck keeps giving me oclusions

Hello Sorry in advance for any spelling or grammar mistakes. I am currently running a accuceck spirit combo with my apps settup and it keeps giving me the oclussion error every couple of hours. My dad tried the pump with physiological serum and it behaves normally. I also changed the pump amd it keeps having the same problem espacially during the night. With omni pod i didnt have this problem. Might the problem be that I am to skinny ? I have a friend with almost the same setup and his spirit combo is way more cooperative.