No logging on production, that’s unfortunate. There’s a large number of possible problems going on here, and the best way (that won’t involve hours and hours of trial and error) is to simply check what Caddy is telling you, via process, access, and error logs.
Unless you can do that, your best chance might be to hope that someone else on the forums here has experienced the same symptoms and pinned down the cause on their own systems.
I also agree with you but when we tried to add the logs last time our “caddy service” go down. So we disable it.
I know it’s the best way but we wanted the working way