Choppy playback when using Smartview to Vorke Z1 android TV box

[mperkinsnz]

I am using Smartview on smart devices to display content on a Tour Coach TV screen.
I find a Samsung Tab A and S2, work very well, with only very occasional static/choppy output.

However I am having lots of issues with Samsung S7, S8 and Note 8.

I have updated all devices, tried using flight mode. bluetooth off, do not disturb.

Your thoughts would be appreciated.
Thank you