I bought them recently and returned them after one night. The battery didn't last even 2 hours and they kept disconnecting from my phone and turning off, but you can't just turn them back on, you have to take them out of your ear and put them into the case to turn them back on. So many design flaws IMO.
That's a setting you can change. It turns off after an hour by default, since the idea is you're using them at bedtime.You can also reconnect them by double-tapping the left earbud. That's what I do if I'm still awake.