Not able to load into eashl games at all

Every single time I load into a game where a buddy it just says error or it says invalid game session. It does this every single time without fail. I don’t know why it keeps saying this even by myself it won’t let me play occasionally it’ll work on certain days so I know it has nothing to do with my Internet. Maybe it does. I could be wrong but it’s getting ridiculous. I can’t even play a game I paid for.