Google drive slow and "an error has occurred"

When loading movies from NAS it takes about a second to play, when loading from google drive with a 500Mb connection, it takes around 2-3minutes for a 60gb Blu-ray to load.

When loading the same movie using kodi and gdrive it loads in 2-3 seconds.

On the other hand Blu-ray Isos are hit or miss while streaming from gdrive (“an error has occurred”), streaming the same isos from local NAS work without a hitch.