Plex losing subtitle while playing

I have this problem since a very long time, at least for 6 month now and it’s driving me crazy.

Plex Server: 1.15.3.876-ad6e39743 on Windows 10x64
Client: Webclient running in Firefox on Mac OS most of the time

Problem description:
Most of my mkv files have embedded srt subtitles, but I guess it happens with external srt subtitles too. After some time (it differs everytime) the subs are simply not displayed anymore. When I pause and select some other subs or “subtitles off” and than back to the initially selected srt, the subs are back again, only to be gone again after some time.

I see this problem exists since 2017, it really is time to fix this. I will try to make it reproducable a little better and also can provide logfiles if needed.

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