Power reading dropping out

Hi all,

I was racing on Rouvy yesterday and either periodically or shortly after big gear or cadence changes my power reading would drop to zero for several seconds. Very dristrating as you can imagine

My cadence was still showing and the resistance was still high, being controlled by Rouvy, and I think the power reading was also missing on my garmin but I only looked once and lighting was poor.

Im using a Zumo with PML enabled, if it matters?