Bootloop issue finally killing my phone?

[fiveighteen]

I've been having the bootloop issue ever since ~November, where the phone will randomly reboot itself for no reason; charging, not charging, screen on or off, in any number of apps or phone call or just on the lock screen. Since I'm bootloader unlocked, I found that going into TWRP and clearing the Dalvik cache immediately fixed the issue (until tomorrow)! It typically happened once per day or every other day, seemingly depending on usage, until this week... I used it as normal, and it hasn't rebooted at all in over 5 days. Today it finally did, and now clearing the Dalvik cache does nothing for it; continuous bootloops. I decided now is as good as ever of a time to do a factory reset and update to stock 8.1 (previously was on stock 8.0 - I did the full wipe with the -w flag). Now it starts going through the setup process but locks up and turns itself off after about 60 seconds. I tried flashing BenzoRom using the below instructions and the same thing happens. Does anyone have any other thoughts? I really have nothing to lose at this point.

EDIT: Also tried Safe Mode with 8.0, 8.1, and BenzoRom 8.1. None worked better than without it.
EDIT2: Well this time I got all the way through setup (did set up as new device) and then went to download an app from the Google Play Store when it turned itself off. Lasted about 5 minutes.
EDIT3: It occasionally even freezes/turns off in TWRP. This is what's really making me think it's a phone defect.
EDIT4: I left it off overnight and it worked for an hour this morning before it turned off. Then I left it off for an hour but it froze immediately after turning on. Bizarre. Will let Verizon "troubleshoot" today (which will be a factory reset and then a shrug) and see what they recommend from there. Don't have high hopes since my bootloader is unlocked, even though that's completely unrelated to any issue. This shouldn't be happening after 15 months. I'm still making payments on it for the next 9
EDIT5: Verizon said out of warranty and no insurance so too bad. Checking with a different Verizon tomorrow and then ubreakifix. Not sure why I'm supposed to have insurance for something completely out of my control.
EDIT6: See reply below. Verizon is replacing with same phone.

For people having trouble booting custom roms please read:

Get a copy of the stock boot.img, twrp-3.2.0-0-marlin.img, twrp-pixel-installer-marlin-3.2.0-0.zip and the Benzo Rom zip.

1. Boot into bootloader
2. run: fastboot --slot all erase boot
3. run: fastboot --slot all format system
4. run: fastboot --slot all format vendor

Go to where you extracted the stock boot image
5. run: fastboot --slot a flash boot boot.img
6. run: fastboot --slot a flash boot twrp-3.2.0-0-marlin.img
7. run: fastboot --set-active=a
8. run: fastboot reboot-bootloader
9. Then select recovery from the bootloader menu
10. Go to wipe. Move the slider to factory reset which will wipe data, but not internal storage.
11. Install benzorom-8.1.0-date-version-marlin.zip and twrp-pixel-installer-marlin-3.2.0-0.zip
12. Reboot

If you want to install root after boot back into recovery by rebooting and holding volume down after you hit reboot then selecting recovery from bootloader. That will take you into TWRP on slot b which is where you want to install Magisk from. I don't use SuperSU anymore so Magisk is all I know that works.

You can get the twrp .img and .zip from their site right here.

 

[fiveighteen]

Long story short, Verizon Extended Warranty at 866-406-5154 went through some troubleshooting (clear cache, then factory reset) then said this is NOT an insurance claim since it's a phone defect and they will replace the phone with a refurbished Pixel XL 128GB (same phone). Was hoping they could bump me up to an XL2 but no dice lol. They sent it with free overnight shipping and I have to send mine back within 5 days. Trading in my bootloader unlocked device hurts, but it's better than having no phone at all. Hope this helps others having the same issues.