Since so many devices are affected, I would suspect that the there was some kind of voltage peak or similar at your location that damaged your miners. What you now need to find out is what parts are damaged.
It was water damage by the looks, i can now see it and the last two miners i opened that are nearest the cold air input tip garage they are in are were wet, we did have a big storm, power outages etc and a fine mist of water ha entered.
They have sat as they are running for years until this, hence my first thinking was some sort of spike in current/network etc as it was all over the news/social media of big outages locally to me.