Bluetooth Ceases to work once Wifi is on and Connected (Latitude 7275)

It's simple, Wifi turned off - Bluetooth connects to speaker and plays audio flawlessly. Turn Wifi on and as soon as it's connected to the network, Bluetooth audio stops and will not reconnect at all. I have 3 Bluetooth speakers, all different brands and it's the same with all 3 of them. I have had 4 totally different Latitude 7275 units from different firms and all have been the same.

Tried

- Updating, deleting and restarting the Bluetooth driver and services.

- Re-pairing all speakers

- Connecting to different Wifi networks

Nothing has worked and I cannot find anyone with the same problem, despite having come across 4 with the issue... How can I fix this?