Hi,
I’m not aware of any changes in june update that would have caused this behaviour and nothing in the logs is giving an indicator. But you would benefit by adding some video cache though:
https://kodi.wiki/view/HOW-TO:Modify_the_video_cache
These used to work quite well on my pi3:
<advancedsettings>
<cache>
<buffermode>1</buffermode>
<memorysize>52428800</memorysize>
</cache>
</advancedsettings>
Also I would suggest looking at kernel mounts aswell, autofs being the easiest to setup:
Thanks Tom.