Just upgraded to an Edge 530 from the 520, currently using the same sensors, a Varia RTL-510, Assioma Duo pedals and a Garmin HR sensor.
Firmware on 530 and radar/light are up to date but I’m getting drop outs on rides, happened twice today and I notice as it comes up saying light network dropped and then reconnects a few seconds later. Bit dangerous with the Varia as I rely on it for Radar use and to alert cars behind me as it’s my only rear light but it keeps dropping out.