Hi, I am using Garmin Vivoactive 4 and when I compare the Pulse ox reading of Garmin with Beurer Pulseoximeter it is showing different numbers. Garmin watch is continuously showing 4 or 5% lower consistently. One of the reason I upgraded my Garmin Vivoactive 3 to Vivoactive 4 three months back is to use this Pulse ox. Please let me know how to fix this?