Some video files don’t seem to buffer (much), and just get stuck. In two cases, they’re 720p or 1080p .mp4 files I made in iMovie. The latter is a 15m video that’s about 3GB. It gets completely stuck and won’t buffer at all. (I can play the version I put on YouTube just fine). Another one is a 20 min TV episode in .mkv format (700MB). It buffered a min or les, even on pause.
Vero 4K+ is on an ethernet connection and iperf3 ranges widely between 33-88Mbits/sec ATM. Mounts are NFS.
I have video on several HDD volumes connected to Mac Pro, but have had problems on at least 2 of those volumes.
Kodi/Vero updated to current (Nov 2019 I think).