I have the same problem. Over 50 errors for last 3 days. Continue is impossible. Im start new game. In my opinions, problem is with the size of savefile. When you start new game, the size is 7,35MB, and if you reach 16,78MB, its over. Just watch the size, and dont let it reach to 16,78MB.
I'm playing on PS4 and i like Astroneer. After too many playing hours can't save and continue, it's very frustrating and game is unplayable. When trying get to shuttle, rover, tractor or shelter, game freeze. Error message CE-34878-0, for last two days over 30 times.