My Garmin Venu 2s randomly switches itself off after buzzing for 30 seconds or so on a blank screen. Connecting it to the power brings it back to life but sometimes this happens during an activity and it is happening more often than is acceptable. Also, attaching it to the power cable is not an option to fix this when out and about. It is still under warranty so I am wondering if the best option is actually to return it if this is a fault.