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Do videos with subtitle cause stuttering on older models?

I have a Roku 2500x and a 3100x. When I play a MKV video on the 3100x, it plays fine. The same video played on the 2500x has a problem. The video stream plays fine but the audio stutters.

The MKV video file has three streams (based on VLC media information output)
Stream 0= video H264-MPEG4
Stream 1= audio, MPEG AAC
Stream 2= subtitle

When I play the video on either Roku, I don't see the subtitles. I see the subtitles when I play video on computer.

Thanks in advance.
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current: two roku XDS 2xs, dtvpal, boxeebox, kylo.tv,
radar: wdlxtv.com
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