What’s wrong with my ERG mode?

Hi there, I’m a bit stumped.
I’ve been using Zwift for some time with my Tacx vortex turbo trainer. I mainly do training with ERG turned on. everything worked fine for ages.
The last few times when I’ve done a training plan my cadence directly reflects my wattage.
So if my target wattage is 70, I have to spin at 50rpm. If I spin at 80rpm then the watts stay at 120 and the watts indicator flashes for me to reduce power. ERG doesn’t compensate.
It’s like cycling a single speed bike and the max watts I can possibly spin up to is around 200.

I use an iPad connected with Bluetooth.
And I’ve been pairing the cadence sensor from the turbo trainer in case the issue was with the wahoo sensor I usually use.
I tried to re-calibrate the trainer In the Tacx utility app but each time it says that calibration failed.
Does anyone have any ideas?
Thanks a lot, it’s a rotten time for this to happen as we’re all obviously going to be stuck at home more.

Hi @Kit_Bolton

Welcome to the forum.

have you tried to update the Tacx vortex?

This may be helpful.

https://support.garmin.com/en-GB/?faq=3VEoEaXZmb213i9QkKefK6

https://support.garmin.com/en-GB/?productID=690889&tab=software

Hi Gerrie,
The Tacx is fully updated. So that’s not the issue

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Ok, so the problem with the Tacx T Trainer is sorted, I changed the tyre on the wheel to a skinnier one and then I was able to calibrate so the turbo trainer is set up perfectly.

ERG still not working though.