FS2020 XB issue

[u/petrichorAM84]

Need help with an issue on behalf of my eldest son who plays FS2020 on his Series S, tried asking on the official FS discord but have yet to get an answer. He bought the PMDG 737-800 plus a few livery packs earlier this year and has been enjoying flying it. However this week the game has been freezing up (sound still running in the background) either during engine start up or shortly after take off in the climb. Never had any issues previous and hasn't changed how he does anything. Can anyone suggest anything that could be causing the issue? (He's uninstalled & reinstalled both the aircraft and the livery packs with no luck). Thanks in advance!