I do apologize read so many forums and fix guides that cant remember what site i read it on.
I have been using Kodi in one form or another since it was called xbmc, used on windows/ubuntu Android Box/Raspberypi/HTPC
Last 6 years have been using OpenElec on HTPC but Changed over to LibreElec as seems to have more regular updates, better support.
* seemed to have fixed my issue *
Changed shares to NFS
Change readbuffer to 4.0 in advancedsettings.xml
Just seemed strange that this issue only occurred after updating to 8.0/17.1
Thanks
**PS during playback debug shows '' Player: a/v 0.000, forward:187.5 MB 100% ''
'forward' is the amount in cache this will sometimes drop to ''forward: 153.1MB 100%'' then return to normal.