My active 2 battey has been amazing through the day. Hardly uses any battery at all. When going to bed at night it drains complely from 80%-0%. I tried everything and finally worked out that it's draining when I disconnect from Bluetooth. I didn't disconnect last night and it lasted the night and only used 10%. Can anyone tell me why this is happening. I have the WiFi set to always off and it's not a 4g watch so what is causing it to drain without Bluetooth?