How to report:
https://bugtracker.arcengames.com/ (Note: you need to make an account to post on this site.)
1. Does the planet you are on have a Black Hole generator?
2. If you could upload the save either on mantis (the link above) or here, that would be great to test the problem.
To get the save: Program files (x86), Steam, steamapps, common, AI War 2, PlayerData, Save. Then open the campaign folder and select the correct save file. When you save in-game, I suggest that you name the save something relevant like "can't leave planet".
On Mantis, you can drag it straight onto the report.
On here: you have to choose the file via the "add attachment" button when replying to a message.
Highly suggest uploading to Mantis.