I’ve had a Fitbit Flex for years (at least 5) which I now only use as a silent alarm to wake up in the AM. Usually I can go a week without charging it but in the last few days it’s completely dead after one night. What’s interesting is it last all night after I put it in sleep mode but after sitting on my nightstand during the day it’s drained. I have a feeling it’s due to the recent app update removing the ability to turn off all day sync but wondering if anyone else has the same issue.
