Tacx Flux 2 bluetooth driver error and flickering connection

I have 2 different laptops with Win 10 on them, both are unable to connect with Tacx Flux 2.

One was working fine until recently, when it suddenly stopped being able to uphold a stable connection. It constantly changes status between Connected and Paired, and the the trainer isn't discoverable in any training app. In the Action centre, it constantly changes between Tacx Flux-2 and Not Connected. The blue LED on the trainer is slightly flickering, following the status on the laptop. 

The other finds the trainer, but then I get the message "Driver Error" in the Bluetooth Settings.The trainer shows in the Action Centre, but the Bluetooth LED on it is off.

The trainer connects to cellphones via Bluetooth flawlessly.

There are no new updates on either laptop (significant for the one that has been working). I've tried the usual: replacing the Bluetooth drivers, turning everything on and off, including other devices that might cause interference, removing other Bluetooth devices, checking the radio permissions, firewall settings etc... nothing works.