another idea could be, not to split the file, but to set chapters for the episodes.
you can go to the episode you want to nearly the same.
no risk for bad frames or loss, not a big effort and you can do with software you likely already have.
there is a chapter-editor in MKVToolNix, you can save direct in the file.
put the file in, create the chapters,
set the start times as the episode start, (look in player-time or avidemux copy-paste time)
and if you want to, you could rename the chapters to the episode-names.
(you could also split in muxer by chapter, but movie-cut is not good here)
but if you still want to cut later, you can use this chapters as cut-times in other software,
so it is not wasted, if you want to try it.