Welcome to the Forum @CosmicFear77 . When you say solo co-op I assume you where using the your Ps4 as the server. You can turn stability requirements off. Lots of large builds can put a strain on a ps4 because it is doing the job of a actual server. With all the updates that have been installed since you played last something may have interfered with your previous builds. IF you have enough friends to warrant it you could rent a Gportal 10 slot server the price is not bad my wife and I have had a 20 slot since the game came out. 37.90 for a 10 slot for 90 days you can lock it so only friends with password can get on the largest benefit no more tethering. Good luck on what ever you decide.

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