The proposed project is a deep follow-up study on the gamma-ray binary LS I +61 303 at GeV energies. It is one of the best studied binary systems at high energies showing a very particular behavior: On top of the orbital period of about one month, it shows a super-orbital modulation of about 4 years in several wavelengths. Since the discovery of this phenomenon at GeV energies, the dataset taken by the satellite Fermi has doubled. We propose to analyze the latest Fermi-LAT dataset on the source, prove or falsify the findings done 10 years ago and perform a deep study on the orbital behavior of the source. These findings will be of great interest for the community.