Buffering when streaming Live TV (HDHR) on Android based players

I’m running at wits end with this issue.

Plex Server Version 1.22.0.4163 on Ubuntu 18.04.5LTS (has happened on prior five releases)
AMD Athlon™ X4 860K Quad Core Processor (Util <20% when streaming per Plex)
8GB RAM (Util <10% when streaming per Plex)
nVidia GeForce GTX 1050 with CUDA drivers installed (HW Transcoding Enabled)
Chromecast and Firestick App updated to latest

When streaming LiveTV content via HDHR to a single Android-based device (tested with multiple FireStick 4Ks and newest Chromecasts) the stream will work fine for approximately 3-4 minutes and then begin buffering rapidly, ever 10-30 seconds. Playback from the same location/network/etc. works fine on Plex App for iOS and Web player. I have tried all variations of automatically adjust stream quality and lowering quality to absurd levels, no difference observed. Have attempted with HW and SW transcode, no discernable difference in performance.

Logs (debug and verbose) have both been reviewed in detail, no errors or otherwise indicated. Happy to upload anything that would be relevant. Welcome any troubleshooting steps you could offer or information requested.

Appreciate anything you can offer in terms of ideas or assistance!

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