Ok, I lost my main save recently of about 1k hours (game will not load at all with that profile). I posted my base here in the galactic co ordinates thread.
I used my other profile to visit the base to see if it was still there and the base is gone but this guys base is floating in space where my freighter is for some reason.
Looks as if that’s the reason for me losing my game. There’s always someone that will mess things up for you given a chance. So be aware if someone makes a base in your system/planet it can do more than just disappear your base.