Resistance on trainer inconsistent

Specs;
Windows 10
ANT +
Kickr Core Trainer
4iiii Power Meter (used in Zwift as Power Source)

Not sure if this i Kickr problem or that it has something to do with Zwift.
But when i do rides the resistance can suddenly become really strong on a -3% or drops on a
6% gradient.
This happens on various occasions during a ride…

When trying the Jon’s short mix on erg mode it was impossible to do.
first interval i got up to 350w and the restistance dropped making it impossible to hit the wattage to complete the workout. I would have had to have a cadence of 200 to make that happen.

Does anyone know what the issue can be ? is it some kind of interverence or a software issue ?

Or can it be because i use my power meter as power source and the trainer as the main source ?
would be a shame as my power meter gives more precise readings…

any help is appreciated.

This could be the case in ERG mode.

also look at this, All About Erg Mode in Zwift | Zwift Insider

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What seems to fix it for me is not using the companion ap on my phone …
Whenever my companion ap is paired as well (even with bluetooth off) i seem to have this issue.
shame because if the steering function will be further developed i will not be able to use it.

is this a common issue and is there a solution to it ?

both my desktop pc and companion ap are paired to wifi… but i dont really know what causes the interference as i turn off bluetooth on my phone and use an ant+ for my pc.