Unique segment numbering or session ID
You either create unique segment numbering or a unique session ID.
Check that the segment numbers are sequentially increasing.
Verify if response received is 200 by requesting random ts segments (first one, last one, middle one) from the playlist.
Check that the EXT-X-MEDIA-SEQUENCE corresponds to first segment in the bitrate playlist.
Verify whether any #EXTINF has negative values in the bitrate m3.u8 files.