Why is bluetooth always go off and on all the time?

I got this headphone 2016 December. It worked well for a while. I left it somewhere for a couple of months without using it. Then I tried to use the headphone on the bluetooth mode it just can’t get connected stably. The headphone can connect to some device for like 2 sec and then disconnected and went back and forth for like forever. I have no idea is it kind of battery problem or it’s some kind of bluetooth problem. I tried to update the software and it seems OK with it. But when I want to reboot it or reset, it just doesn’t work. What’s more, I don’t know why the bluetooth just get connected and disconnected automatically. I can’t clear the pairing list even. What happen to it? Is there any way to fix it? Or I can only drop it to the rubbish bin.

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