Repeated Vector 3 disconnections

I know people have had similar issues in the past but wanted to obtain the recommended course of action for virtually new pedals. Pedals were brand new as of mid April this year (I assume they have the v3 battery doors as there was a long delay in my LBS sourcing the pedals). The pedals have been rock solid until this weekend.

The pedals started disconnecting every few minutes on my ride. At the half way point I removed the pedals from the list of my Edge 820 sensors, before reconnecting them. But the disconnections continued.

Battery still reads as strong when connected to my phone. I was planning on swapping in new batteries to see if that sorts out the pedals, but my concern is that the battery level is currently fine anyway.

I am off to cycle from Nice to Geneva in two weeks so this is not ideal timing.

Thanks