Power Fluxuations

Hi, I use a Tacx Flux set up via blue tooth on my i-pad. For 4 years I have had no issues, however recently when doing a Zwift workout the power drops out for a split second every 20 seconds or so, see photo.

I have reinstalled the APP numerous times as well as recalibrating my trainer.

Any thoughts would be appreciated

Shut off Zwift and try to reproduce the problem using the Tacx app. Do the firmware update, calibrate the trainer (which you should never do in Zwift) and do a test ride in the Tacx app. If any of that fails contact Garmin support.