I finally found out why I was getting intermittent dropouts. Around 13 minutes into my ride, I snapped a picture using the mobile (Android) app. A few seconds after, I lost speed, cadence and power metrics. I tested the theory 3 more times on my ride: at 13, 30 and 40 minutes. Each time I would snap a picture, dropouts.
Below are the actual snapshots I took. I started my Garmin and Zwift at the same time so the Zwift timer and Garmin time should match, within a few seconds.
I’m running a PowerTap G3 for power/speed/cadence. My head unit is a Garmin Edge 500 and my USB dongle is a Suunto. I’m using a Samsung S5 to run the mobile app, Bluetooth turned off.
Before you say it’s a Garmin issue only, my Strava capture shows dropouts too (see below):
Is this a known issue? I don’t get on the support forums much.