My Nexus 6P got a bootloop issue a week ago. I cannot also access its recovery mode as it returns to a Google logo after doing it. My device had just passed the warranty period for 2 months before it was bricked. Sadly, I decided to buy my 6P because it is branded by Nexus, i.e., Google.
I initially thought that the bootloop issue was from the software update to Nougat since the issue started immediately after the update of 7.1.2. I tried to fix it by re-flashing a variant of stock roms from 6.0.0 to 7.1.2, but no luck occurred.
However, I want to share my experience that I accidentally managed to boot my device while it was being charged and lied on the bed (causing the heat from charging, accumulating to one point that enables the device to be booted). I think the problem may be from some hardware defects of socket bonding on a motherboard. After I figured out, I tried to use a hairdryer to blow the heating air to the top area of the device where a motherboard is located (in front of and behind camera) without disassembling the device. After the device attempted to boot for 5-10 times, it could be booted "temporarily". However, if I let the phone cool down, the device just stopped working (frozen screen while trying to type for search in chrome) and rebooted to bootloop again. I repeated this procedure 3 times and it surprisingly worked. I suggest this procedure, in case someone wants to take out some data from your phone but this won't permanently fix the bonding problem.
I think Google and Huawei both should be responsible for this defect, since the 6p was sold under their both brands. It is very weird that most of bootlooping 6p devices have had such problems just before and immediately after the warranty expires. Especially, for Huawei I wouldn't have bought its product if it hadn't been google branded. It seems deeply skeptical that Huawei might intended to lower the cost of production that may cause the defect or to intentionally let the phone die after the warranty period.
Anyway, are there any updates from class action lawsuit for hardware defects on Nexus 6P ?