I am posting this here in Apple TV as I do not know if this behavior occurs in other platforms
Various MKV files would crash frustratingly on Infuse. I realized that typically they were usually foreign movies with subtitles. I started experimenting and discovered that it was the supplemental font file attachments in the mkv’s that would cause the crash. Removing the font attachments solved the issue. I hope this helps others out, and lets Firecore’s support team to figure out what the problem actually is.