***''Disable and Re-Enable the Internal Battery via program logic''***
Hold the JBL CONNECT button beside the power button, and volume up, until the fifth light flashes red. Then plug in the JBL Extreme if not already and power it on and do the key combo again to enable the internal battery again.
-->This totally fixed my BT Connection issues and where the unit would Abruptly power down when connected via Bluetooth. Also it sound better too like it kinda sounded blown before idk maybe that like my placebo ears.
I also did a ''Full Reset (Volume+ & Bluetooth(or Play for some JBL Models) Buttons Held for 10 seconds till reset)''