So, did the Zwift camp stage one 2 days ago, after the start erg mode just wouldn’t work. Trying to spin at 90rpm at the start was pushing the watts at nearly double of what was asked!
I stuck it in gear mode to finish the workout which was fine and will be something I do more often.
Has anyone else had this this problem? I’m on a wattbike atom v2.
I’ve not had any problems recently. If I ever feel that Erg mode isn’t working well, I tend to stick in Resistance and shift up or down so I can hit the target watts at, say, 85rpm. Then I’ll put it back in Erg and try to hold a steady cadence and wait for it to re-engage.
Or I’ll just switch to Resistance and leave it there 
Ok, it’s happened again, so mid workout I re connected everything with ant+ instead of Bluetooth (apart from HR) and erg work great for around 5-10 minutes, then went crazy again reading way over desired watts at the cadence I was ask to ride!
Starting to think it could be a wattbike issue but can’t confirm. Frustrating thing tonight was the workout wasn’t that easy to do with the gears, so just had to ignore most of the prompts to finish.
Ok, just in case anyone has this problem.
It worked fine in Apple TV. So I reinstalled Zwift on the PC, it was still a bit erratic and thought I’d test on an old iPhone 11, again it worked fine.
Next morning fired up pc and everything worked fine! I did a full workout in erg with no problems! Who knows 
I think my Microsoft surface pro 6 is maybe at its limit running Zwift.
Ok, @shooj could you check this out for me , I keep losing resistance/ erg. Watts aren’t changing at all to match workout, now just to add to that I can’t switch out of erg to use gears. So I’m doing the last breakthrough workout locked at around 120watts.
Have you contacted support? A forum post doesn’t come with the promise of any response. It might happen, or you might be kept waiting longer than it would take to get an answer by contacting support, and then you might end up contacting support anyway.
Will do Paul. I thought I could sort it myself with all the usual steps/fixes. But it’s getting irritating now.