Tha last couple of days I’m having intermittent issues with my Zwift Hub One:
When riding on my most recent ride between 350-420watt, I hear a cracking noise and the resistance is gone for a few seconds & comes back very quickly. It scares me because when standing up this sudden drop makes me fall on the bike frame.
Another recent issue is that at low power, ex during warmup the cadans (rpm) indicated by the hub one is way off.
I have the hub now for 1.5 years and did around 6500km on it.
You should contact support.
I am not Zwift staff but my understanding is: UK/EU customers have a 2 year warranty and hopefully get a replacement. US customers have a 1 year warranty so it would be too late for that trainer. (Zwift Limited Warranty and Return Policy)