64gb Verizon 6S just turned 2 years old. was working 100% fine and then on Monday Night Just shut off and won't turn back on. Apple store says its a bad logic board and nothing they can do but offer a $300 replacement. Said no known cause for the failure- no water damage or other damage present. Never heard of this happening and wanted to see if this has been experienced by others or is this something Apple should be helping me out with? Only other thing to mention is that Apple replaced the battery in December 2016 under the replacement program. thanks!