I had the same problem. while I was on my bike I accidentally pressed some button combination possibly JBL Connect + Volume up It didnt turn on again. then I opened it up, rooted around without any result and closed it up again. not very difficult BUT BEFORE you open it up try the reset option plug it in, as soon as you hear the "here I am" sound remove the cable and press Volume UP and Play / Pause buttons at the same time and hold them until a hard reset occurs. here are some button combinations for the charge 3 I found on reddit JBL Connect + Volume down says the firmware number and blinks battery level diodes matching said numbers (coincidence?) Volume down + Bluetooth 10sec turns off inbuilt EQ (and limiter?) JBL Connect + Volume up weird mode, possibly FW update mode (to go back, connect to powersource and hold the combination again) Volume up + Play/Pause resets the speaker lets all bug JBL about releasing the button combinations for Flip 4 as they are nowhere to be found #JBLCmon