So my S9 Plus began doing this about 4 days ago. My phone is in perfect condition never being out of its otterbox case since it went from the box to the case while still in the store. After doing a Cache clear, running in safe mode and doing a factory reset, samsung tells me I have to pay and send my phone in to be fixed without a replacement device while mine is repaired??? oh yeah Warranty just expired on 5/22/19. I notice that once it enters sleep mode the white lightning bolt on black screen appears and the phone shuts down and usually reboots, this happens no matter what battery percentage I am at. The phone works fine as long as I am actively using it, but once it goes into sleep mode it shuts off completely.
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