[Verizon Galaxy Note 3 Q&A, Help & Troubleshooting] LoganDark:
I have an SM-N900V (Note 3, Verizon variant, hltevzw).

Detailed timeline:

- I flashed it back to firmware OB6 using Odin 3.09.

- I rooted it using ArabicToolApp.

- I used this tool to unlock the bootloader

- I installed a build of LineageOS 14.1 for hlte

- It didn't recognize the SIM so I did a dirty flash of this build of LineageOS 15.1 for hltetmo on top (hltetmo actually has different hardware than hlte, and the correct one for SM-N900V)

- Messed around with the APNs until it recognized and connected to Verizon's network. I DO have functioning SMS and LTE data, but I have not tested phone calls yet

- Messed around some with SuperSU in system- and systemless-mode. Bricked my device more times than I could count, then unbricked over and over using SuperSU's impeccable installer. Messed around with this quite a bit

- Also messed around with Xposed some. The OS is too unstable to run Xposed Installer correctly, so I uninstalled it

- Removed SuperSU, installed Magisk. Phone now passes SafetyNet

So, my phone now runs 8.1 and a Lineage build from 9 days ago. Cool. But, if I was satisfied I wouldn't be making this post. There are multiple instances of the same kind of "app freeze" - App screen freezes, sometimes it'll go completely black. Interactivity doesn't work, obviously, the app is completely frozen. Hold Back to kill doesn't work (Application Killed toast shows, but nothing happens). ANR (when it comes up) Close doesn't work. Home button works and brings me away from the app, but it's still there. Swipe away in Overview doesn't actually kill the app. Even in App Info, Force Stop doesn't work. The app is forever frozen. Tapping the icon from the launcher no longer does anything, it doesn't even bring up the app. The app is permanently crashed and inaccessible until a reboot.

Issues:

- Sometimes when booting the phone will not recognize the SIM until a reboot. As in, "No SIM" message and everything

- Sometimes it will get stuck at boot, I have foxy-boot installed, so I can see the logs. I don't remember what it was all about, if it comes up again I'll update the post

- Google Chrome sometimes crashes when trying to download a file. I've gotten my phone to self-host before, but this issue always seems to come back, and when it does Google Chrome ALWAYS crashes when trying to download a file. App Freeze

- Netflix installs and logs in but freezes at the "can't connect to service (-9)" message. App Freeze

- Certain apps like NativeScript Playground get stuck at the splash screen. App Freeze

- Xposed Installer did this when opening the Settings, whether Xposed was installed or not. App Freeze

- F-Droid also sometimes crashes, although it's somewhat arbitrary, I can't reproduce it reliably. App Freeze

I have tried reflashing the ROM, flashing Xposed uninstaller, reinstalling Magisk, none of it seems to work. I have TWRP 3.3.0 so I can do pretty much anything that doesn't involve the SD card (the SD card is probably broken in hardware, it's so read-only that Android and TWRP both can't write to it at all, but they can both read the same half-broken filesystem).

I fear that this OS is just too unstable for the phone and there's nothing I can do. I sincerely hope this is not the case.