Headset is not turned off sometimes

Hello.

It often happens with my headset (void void wireless), that I power it off, leave for night and at the morning battery is dead. Recently I noticed, that after I power it off, there is still orange light blinking slowly.

My procedure is:

1. remove usb stick

2. hold power button until sound signal

Then I can see orange light (next to the mic, to the left). If I see this light, I know battery will die in several hours.

Sometimes it happens, sometimes not. That wasn't definitely an issue before, but lately (last month) I had this problem for few times already. This is really annoying.

I tried to enable/disable them again, tried to remove stick after/before powering headset off - no luck.