From what I remember, the Nexuses 5x had a manufacturing error, which caused them to spontaneously desolder some components from the board, resulting in the bootloop. This was a problem in a lot (maybe even most) phones. Mine was in a bootloop too. There was a class action about it too, see if you may still be able to claim cash: https://www.theverge.com/circuitbreaker/2018/1/31/16957332/l...
I strongly doubt Google's narrative about a manufacturing defect as the root cause. Several different devices with varying manufacturers were affected. In my case, the bootloop began immediately after the upgrade to Android Oreo.
Google told me, a US customer, to send my device to Huawei's nearest service center in mainland China at my own cost for diagnosis and repair. That is unacceptable for a Google-branded product designed by Google, unveiled by Google, marketed by Google, sold directly by Google, warrantied by Google, and bricked by Google.
Imagine, if you will, Audi sending you to Bosch in Germany (at your own cost!) after an Audi dealership in Indiana bricks your ECU during a recall service.
