So far the AW 4 is working fine - when it's on my wrist. But when it's charging the animated green "lightning bolt with circle" will show up at random times, no rhyme or reason. This has been going on for a week plus now. But this ALSO seems to trigger the rear green light sensor. This will remain on, not sure how long though...it varies. When I am ready to take the watch off the charger, the back is warm - not hot...just warmer since the sensor has been on. Just odd. This is not happening on my old AW 1 watch, it never happened in the 3+ years I've had this. Anyone else? I've checked the USB "puck" connection, everything is fine.