Lose connection between laptop and Tacx Flux

Hello.
I’m a new user of Zwift, but I’ve got trouble running Zwift from my laptop.
Everything is okay from the start, but after 5 to 10 minutes, it seems that the Tacx Flux S loses communication with Zwift. When I switch to TACX everything works as it should.
Do you have any advice for me.

ANT+ or BT?

If ANT+ do you have a USB extension cord?

I use Bluetooth. Has 2 laptops. An old with BT adapter 4.0. and a brand new one with BT 4.0. The same problem applies to both.