Flare 2 TURNS OFF 5-10 seconds after turning ON

Hello.
Have used the speaker for maybe around 10-15 hours in total.
Recently this annoying thing has started to happen. I turn on the speaker and it turns off automatically within 5-10seconds before pairing.
After some more tries it stays on. What could be the cause?
It happens when the battery is 90% or lower.

Write an email to the “support”.
Wish you “Good luck”!

OK thank you