Sound conflict when using Rekordbox/ DDJ1000 though Skype or Zoom.

Hello! I am a DJ Tutor who has been teaching DJing online for the last 3 years using Rekordbox, my DDJ1000 and Skype. I always use direct sound (controller plugged into a soundcard like the M-Audio m-track or the focusrite) as it's a more professional sound for my students at the other end rather than coming through an external mic. Since the last 2 Rekordbox updates my sound glitches when I'm on a Skype call like it's skipping and I cannot figure out why? Skype on its own is fine and Rekordbox on its own is fine but not together anymore? I have tried 2 different laptops both of which are 11th gen i7's with 16gb ram, 2 different soundcards, 2 different usb leads, the laptops internal sounds and even switched to Zoom to see if it might have been Skype but I always get the same glitchy skippy conflict even on Zoom? The only constant is the DDJ1000 and Rekordbox so I believe it is related to the last 2 updates. I've played around with the audio settings within Rekordbox but it makes no difference. Any ideas what can cause this as I am at a loss and I don't want to just go back to the old version 😥