Synology transcoding produces broken video

Server Version#: 1.18.5.2309.f5213a238
Player Version#:8.6.0.20351
Synology: DS920+

Hi!

I discovered that if I sync from my plex to my Android phone then I get a broken mess of pixels (sound works fine though).
It works fine if I sync while on wifi - unless I add subtitles. Which, I assume, means that it’s the transcoding that’s broken.
It also works fine while streaming - unless I change the resolution. Which sounds like a transcoding issue too.
If I turn off hardware acceleration on the server then it syncs just fine. And streams just fine,

Specs for the Synology are here:

CPU is a Intel Celeron J4125

Any ideas?

https://forums.plex.tv/t/synology-faq-questions-answers-and-a-few-how-tos/490215/32

Thank you!

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