Hi.
I own an Edge 840 and an Epix Gen 2. I have been cycling with a power meter since last Friday, which caused the Edge to start calculating Cycling VO2 max after each ride. Unfortunately, I noticed that after syncing with Garmin Connect (iOS App), it also overwrites the standard (running) VO2 max by the same value (and date!) as the Cycling VO2 max. I don't know if I'm the only one with this? It looks like a very serious bug....