[Help] O2 Cocoon big problem..!!!

I have O2 Cocoon but i dont know why sometime it's automatic turn off and i need to take off battery and put it in again to make it work
And 1 day it's off again but when i turn it on...it's keep repeat start up screen...and it's doesn't booting....!! it's always stuck into start up screen and keep repeat like forever...!!! and the important thing is it's can turn on start up screen when i plug the charger in....and with out charger it's said battery is too low (it's always said that when i have charger on...[When i hold Power Buttons)
Can't load start up screen on with out charger....!!!

Some one know how to fix it or have some idea to fix it..!!1
Thank you

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