MSFS 2020 CTD Issue

Hello,

One of these again. Just looking if anyone has had this problem.

Did a 3,5hr flight today no problems other than GSX crashed after pushback. Flew on no issues, landed and shut the sim down. Then ate, watched some Netflix and wanted to fly some more, went to start the sim but all of a sudden I'm stuck on 'Checking for updates' for 10 minutes, then the default blank loading screen for another 10 minutes and once main menu pops up it crashes immediately.

I did not change, restart my PC or install any addons between the two flights. Been troubleshooting this for 3hrs now without success.

Any ideas before I install everything again?