I had the same problem last weekend. My phone automatically restarts every Saturday night. I woke up Sunday and my phone appeared to be bricked. I tried to charge it with different cables and nothing worked. Finally figured it was toast and bought a new phone. After sitting about 24-48 hours I tried once again to press the down volume and power keys and this time I got a strange pulsing circular display with about a 0% (or very low) in the middle. I charged it up and was able to turn it on like usual. I went through and made fresh backups, then tried another restart. It shut down and now appears to be bricked again. I think I received an update a few weeks ago, so I'm assuming the issue is with the update. Did you ever get yours to turn back on?
... View more