My so keeps shutting off on it's own, I've had this problem for a while now. I have done a master reset and clear cache partition but still it continues, any advice?
My S9+ only last 9 months, and I'm in the process of replacing the battery and it had moisture inside it. Take out sim tray check for the white sticker its square. Red means water breached. I would back it up to Samsung Cloud and factory reset it.
Sorry, you reset it and cleared cache, run developer mode USB debug and use trace logs.