I have a hybrid HR (not in use atm), it is not an issue on that device. Their wearos watches for a few years had this small flat ‘o-ring’ that held the damn charging receiver, and when your body heats up as it does from physical exertion, or just from a high ambient temp (I’m from AZ, USA) the gooey flat ring loses its adhesion and slides free, which means the charger receiver falls off, which means your watch is now a paperweight. First time they exchased it, second I got a refund.