Please make sure the device software is updated to the latest version on both devices. When you connect the watch to your mobile device, the device battery may drain more than normal while syncing data, such as contacts, etc.
I suggest you to please utilize the optimized power mode and app power management feature to extend battery usage time on your mobile device.
Settings > Device care > Optimize now
Settings > Device care > Battery > Power mode > Optimized
Settings > Device care > Battery > app power management > Adaptive battery(On)
Settings > Device care > Battery > app power management > Put unused apps to sleep(On)
Please note that usage time may vary depending on your device settings and operating conditions.
Hi, Your device needs to get examined by an authorized technician to know the root cause of the issue. Please note that due to Government COVID regulations, some of the service centers would be operating with curbside pick up/drop off and may operating on limited hours or non-functional depending on the locality. Please contact the live chat by using the link below and they help you set up the service.