Hello,
I have very often problems with the playback of mkv movie files (720p/1080p, no 4K) on an external hard drive (Seagate) which is connected to my Vero 4K via USB. The typical issue is that access to folders and files takes a long time and the stream then usually stutters after a few seconds, freezes, and then the playback stops and a black screen is displayed for seconds. Sometimes a blue circle with the number 100 inside is displayed before stopping. It also happens that the Vero hangs up completely during the access while the activity wheel is still displayed, but not turning.
Although the hard drive works perfectly on my Apple Mac and a diagnosis did not reveal any errors, I suspect that something is wrong with the drive. I have therefore uploaded a log file (https://paste.osmc.tv/emiziwugat) with the request that someone takes a look at it. I am a complete layman and do not understand such messages. For the logging, I had opened and closed several movie files, until the error described above appeared with the last logged file access.
I think the problems cannot be due to the used USB cable, as the movie files on another hard drive (WD) are played back without any disturbances or delays.