Was this app not working? Tacx has two apps.
Your problem sounds connection based to me. I had loads of trouble with my Neo2 in my old place.
I also remember that the Tacx utility app doesn’t have an exit button. That can really mess with things if you’re using a Bluetooth connection and then try to connect with another app through Bluetooth.
I had really poor 30 second interval response when I had interference. You can try sitting your phone or laptop right next to the trainer to test that one.
Hopefully it’s not the trainer.