Heart Rate data constantly going to 0 then back to normal during rides/workouts/training progarms

When ever I am using Zwift, my heart rate will go to 0 and then back actual heart rate. The amount of time it stays at 0 varies (sometimes down and back quickly, sometimes stays at 0 for 10-15 seconds). My watts and cadence stay constant. Power, cadence and HR are all connected via Ant+ dongle. Below is my setup:

Wahoo Kickr
Garmin HR strap
Garmin cadence sensor
Zwift App running on my laptop
Using Ant+ dongle for my connection

Did you try new batteries? Do you wet your hr strap pads before putting it on.