Fitbit One turns off

[Chartka]

My Fitbit One just turns off. It's fully charged and then after it turns off the only way to turn it back on is to plug it in. When it comes back on the battery is half done. 

[WendyB]

Please clean the contacts
http://help.fitbit.com/articles/en_US/Help_article/My-tracker-s-battery-isn-t-charging/?q=not+chargi...

Then Do a Restart
http://help.fitbit.com/articles/en_US/Help_article/1186/?q=restart&l=en_US&fs=Search&pn=1

Also See this thread for charging best practices. If you are not charging it correctly you could be damaging the battery
https://community.fitbit.com/t5/Charge/Fitbit-charge-battery-problems/m-p/1323307#M53291

http://help.fitbit.com/articles/en_US/Help_article/1799

If that does not help contact support
http://help.fitbit.com/?cu=1

[SunsetRunner]

My fitbit1 has repeatedly shut off during day with full battery charge and new 6.64 software. Repeat calls to customer service have only yielded two further responses. We’re working to solve the problem and I should buy another one In the meantime. Seems like they are incompetent as this problem has been reported on this site since 2014. I would not recommend this device as it is poorly designed and supported. 

[SunsetRunner]

I have the same problem. I charged it and was able to restart, not interested in buying a new one. Want the current one to work right. Who says a new one won't have the same issue?