TACX FLOW going abnormally slow

Hello, got a problem with W10 update when I could not find the trainer icon in the PC App. Got to unistall the W10 update a it looked fine. Then I started my training and the speed a watts where totally confused. Got 230W and was way too slow (about 28 km/h). I was even way too slow on the flat road comparing to my previous trainings (aprox. 60-70%).

I have all the TACX firmware updates and am connected via Bluetooth. Also tried to reinstall the TACX PC App. Unfortunatelly have the same problem when I tried it via mobile phone and also a different track where I have direct comparison (did the Giro TT several times already).

Do you have any clue what should be the problem and how to handle this? 

Thank you in advance, Richard.