Sudden Bandwidth Cap
I've always been able to stream videos at any stream bitrate. Suddenly, since a few days, I can no longer stream to iOS devices and Apple TV at more than 3 Mbps. I checked the Plex server settings, but I cannot find any limitation. Streaming to web client seems to still work at full speed.
It shows the playing session, but on iPhone it buffers forever, on AppleTV it stops after a few seconds and returns me to the screen for the TV episode.