Resistance has stopped working

Had my Flux 2 a couple of years and clocked up just over 7,500 miles on it. 

I started some Gran Fondo training and got to part way through week 4 then the resistance suddenly stopped working in the ERG mode that the training uses.

I also tried it on a normal ride in Zwift but the hills do not add any resistance at all. 

Tried all of the usual restarts, repairing etc but to no avail.  I tried it with the TACX app as well but still didnt work.

I use Windows 11, Zwift and Bluetooth connection which has been fine for all of my riding.

Has my device given up the ghost and needs repairing?  Any suggestions welcome.

I did consider replacing it with the new Tacx Neo 3M but at that price with wifi not built in, no chance!!