Plex playback stuttering on Apple-devices

I’m running PMS on my Synology DS923+ for several years perfectly but something has happened lately.
My content has started to stutter, sort of (local LAN, ,WIFI6 network). There’s no transcoding involved, direct-play only. It almost feels like movies are playing back with the wrong framerate (but there’s no such settings on my iPhone 16Pro). My ATV 4K is configured to match content framerate.
Anyone got any hints for settings I should investigate?

They have screwed up all the Apple apps recently. If nothing changed on your end you are probably just seeing the effects. For now use infuse

Sad to hear… Any more info about this somewhere?

Several posts over the last month. Plex has not said yet what the plan is.