Tacx NEO and Genius Smart simultaniously gives power issues and power drop outs

I have in the same room two set ups. NEO and an Genius smart on two separate desktops and on two separate Zwift accounts. When we use them together on the same ride on Zwift we have power issues and drop outs on both. It looks like they interfere each other although seperate connected in Zwift/and desktop.
Suggestions anyone??

did you use the https://zwiftalizer.com to check if the signal shows drops?