PleX switches to transcode after a while when casting to chromecast

Server Version#: 1.26.0.5715
Player Version#: chromecast

I have a first generation Chromecast plugged into a 1080p Samsung TV. I mostly have 1080p media that I direct play on this device. However at seemingly arbitrary times the playback stops for a second or two, giving a grey screen then resumes, but now transcoding the media.

Example:
1080p (H.264) → 1080P (H264)—Transcode

Why does this happen? Why can PleX play the media for a while in direct play then suddenly change to transcoding? I cannot force it back to direct play by selecting the quality, it just ignores it. The only way is to restart the playback, but after a while it will switch over to transcoding all the same.

I have tried to use a Chromecast Ultra that I have lying around to see if that changes anything, but the behaviour is just the same. The problem does not persist on the CCwGTV I have connected to another device.

Any help or tips would be much appreciated.

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