Mmmhh, that rings a bell, see Gopro Hero 6, Stuttering Video - #26 by JimKnopf … but this should be fixed already.
Could you also put one of these gopro files on a USB stick and try to play it with the stick inserted into the Vero? If it is the same issue, it’s not realted to the network/smb/etc. at all but soemthing special with the gopro file format like that issue from 2018.