I have a kicker core and I use Zwift on my iPad.
I done a ramp test yesterday just after updating Zwift. Each intervals of the ramp is 1 min but my kicker that I put into erg mode for the test was holding the power for 65 to 70 seconds and then chaining to the next step. So after 7,8 minutes I was a full step behind eg I was asked to hold 300 watts by Zwift but my erg was holding 280 as it was fallen behind.
Tried a workout in erg mode today and the same thing happened the erg mode was slowly falling behind what Zwift was asking me to do.
Just wondering if this is a Zwift of kicker core problem and if anyone has has something similar and if it is possible to fix.