Resistance drops mid-ride

Hi everyone,
Recently while riding in group rides, resistance seems to lessen though wattage increases. It’s frustrating to get 10 miles in and have the ride become inaccurate. I’m about a 250ftp and am able to easily sustain nearly 500 watts when this occurs. Any ideas?
Apple tv4k
Zwift companion
Wahoo Kickr.

Thanks, Jake

The first thing I’d do is check that your versions of Zwift and Companion are up to date. Next, it may help to check for a firmware update on your trainer, followed by a calibration. If this doesn’t help, then I’d like you to submit a support ticket so we can further assist you.