KANGER KBOX 120 wont stay turned off

I have a Kanger Kbox 120 w and two days ago it started to not stay turned off. I have looked online everywhere and no one seems to know what I can do. Could you please see if you can give me any suggestions? Everything else works fine but Im not willing to take the batteries out everytime I want to turn it off. Also, how much do you charge?  I have a feeling Im going to have to buy  another one so I am checking prices while i am asking for help as well.  Thank you very much and I will be waiting for your replay as soon as your schedule allows.