Interesting, I’ve had a pretty good experience with Jellyfin recently (it used to be pretty unstable but has gotten better with time). I mostly use the browser and Roku clients, and haven’t had any issues apart from a couple of movies that stuttered. I’ve used it over LAN, a VPN, and just straight port-forwarding. However, I am running it on my Windows gaming machine since my Linux box isn’t fast enough for 4K transcoding, so it could be that the Windows version is more stable for whatever reason.