IN MY PS 5 CONSOLE, FC 26 GIVES A WARM-UP WARNING

Dude, I had that problem too, but after the latest update, I think it's working better. They might not mention that they improved it, but so far, so good. Have you tried the latest update? Actually, the same thing used to happen to me; that message would appear almost immediately after a few minutes, but now it doesn't. Well, for now, who knows if it will go back to that.