Is there a reliable way of connecting Vector 3 via bluetooth?

I am running a pixel 2, I try to connect my pedals to the Garmin Connect App, I turn the pedals 1/2 a rotation, the lights flash red then green, the phone says they are connected, I click the Device Settings menu, then it says they are disconnected. This game repeats a couple more times until the App crashes. Has anyone got a reliable way to connect the pedals?

Cheers!