if the issue isn’t hardware (so if it was perfectly working before), you could open a “New issue” in the gitlab.
You can generate logs using this method or this one, and then share the file in the issue with the “Attach a file” button.
But don’t expect a quick action.
You could also install the last dev Oreo (Android 8) build instead of the stable Nougat (Android 7) build you installed thanks to the Easy Installer. Maybe the issue will be fixed.
To install Oreo (expect to loose your data):
- download the latest zip file here (directly via the Browser, or via your laptop and then by transferring the file into the internal storage of the phone),
- go into the recovery mode (TWRP) : turn off the device and then long press for multiple seconds on the Power + Home + Volume plus
- Slide the arrow to allow modifications (if prompted to do so)
- You should be in the main menu, click on Install, click on the zip file you previously downloaded and swipe to confirm the flash.
You could try to “Reboot System” (and click on “Do Not Install” if prompted), it will probably work and you won’t even have to restore your data.
Though you could also come back to the main menu of TWRP and do a Wipe > Format Data > yes to delete data in order to start from a clean installation.