Kerbal enhanced plus dlc losing save data

[Jeffjeffjeff]

I recently came back to kerbal on my Xbox series s and bought the expansion to go with it. Playing a new career, I get some way through the game (roughly attaining orbit of mun) when the game crashes out of career mode at the end of a mission and into sandbox. At this stage, it decides all my save files (as I saved incremental versions in case) are corrupt and deletes them, so I’m left having to start my career from nothing again (for the third time now )