Just a heads up, you can probably just do a "Verify Files" instead of a full redownload next time this happens. If redownloading fixed it for you, chances are a few game files just got corrupted somehow and reinstalling fixed it. "Verify Files" should check each game file to make sure they're valid and redownload just the ones that aren't.
Is patch 3 already out on Steam? I don't have any problems with the version before that from GOG. Running it directly without the launcher through Lutris.