My Gear S3 Frontier won't turn on. When I put it on the charger the display shows and it is charging. I've tried holding down the power button for over 2 mins. I've tried holding it while on the charger and I've tried holding both buttons down. It's unfortunately disconnected from my phone, so I can't reset it that way either. It says the battery is at 100%, so that's not the issue. Please help!