Kickr Skips when Hitting Incline above 10%

Odd issue where my kickr “skips/slips” when I hit an incline of above 9-10% regardless of power. racing hills of 5-6% at 300watts no kickr issues.

no issues when doing intervals at much higher watts with a similar cadence.

has this been an issue or happened to anyone? I usually ride with the trainer difficulty set to 100%.