Zwift Hub lost calibration and will not recalibrate

Zwift hub appears to have lost the ability to sense speed. It’s showing approximately half speed of what it should and this makes my Watts very low. I have to stay in the highest gear all the time unless I am on a very steep grade.
When I a calibration no speed shows up at all and therefore cannot calibrate.

Any ideas? It seem to be a speed sensing problem… i can only develop speed in a ride, it wrong but there, however, I cannot develop any speed in the calibration function to attempt to fix this???

I seem to have this exact same issue as of today. Currently it’s more a less unusable. Hope they provide a fix as something is clearly wrong.

Check if virtual shifting is enabled in Zwift settings. If so, turn it off.