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Has this always happened ever since you've had the game? Or only since when?

Does it happen with both local and cloud saves?


Add stellaris.exe to the exceptions list of your antivirus app; ESPECIALLY if you have Windows Defender, add it to the Ransomware "Apps Allowed Through" list.

You should add steam.exe and C:/users/<UserName>/AppData/Local/Programs/Paradox Interactive/launcher-v2.2021.8.1/paradox launcher.exe to that list.