Controllable/erg not working in workout mode

Hi all,

I have had an issue with my direto xr trainer on zwift for thr past 2 weeks.
When i select a workout, the controllable is not working.
If i start in ERG mode it gradually increases the target power until it hits unridable wattages within 3 to 4 minutes.
If i then turn off the erg mode, the controllable is not adjusting up and down gradient.
If i get out of workout trainer is working fine with chnages in resistance on differing gradients.
I have updated firmware, zwift and done spin down.
Any other ideas?