Unable to connect to configure Server

[Rew452 15]

On my Nvidia Pro I am getting when opening Emby this message "Unable to connect to configure server" this last for second or so and goes away. I Have up to now ignored this since movies and video's all seems to play.

I need to explain that a couple months ago I changed from a Qnap NAS to a Asustor SSD NAS using the same IP as Qnap which is no longer on my network, 

For the most part everything seems to play Bluray's, DVD's & video's; But I add a new mp4 video and it is slow to start on Emby and then plays for few seconds and seems to buffer and plays a few seconds.

Other mp4 video's play fine. The offending mp4 video plays fine on my PC so I don't think the files is bad. 

Is there some setting that need to be change after changing NAS's??

Thanks

Rew