Win 10 1703 kodi 17.3 playback mkv problem

Hi,
when I watch an mkv movie or tv show it goes fine the first 8-10 min, but then it hangs and usually crashes. I have tried to extend buffer in advanced settings, but it doesn’t work. I think it’s a network problem, but can’t find the point of failure. Here is the debug log.

http://pasted.co/e9b60fb7

pw network

PS All my media is on a Freenas 11. I have tried both NFS and SMB share. When I copy files from NAS I get speed around 900 MBits/s

/poul