[HELP] LG G2 Constantly rebooting plus other problems

Hello, I bought a refurbished LG G2 and the unit has a few problems (that I think are related to each other). First of all, the device keeps rebooting, sometimes it gets stuck on the LG logo, sometimes on the AT&T logo and sometimes it boots and works for a few minutes then freezes and reboots again. I tried factory reset, reflashing the firmware (using tot files) but nothing works.

Other symptoms include :

1. When I turn off the screen it never turns back on (double tap/power button don't work)
2. The date and time are reset every reboot (time always goes back to 12:01)
3. In the "About this phone" section, there is no baseband version, no IMEI, no wifi info (mac adress etc)
4. Cellular, Wifi & Bluetooth do not work
5. There is a constant "Error" notification on the bottom of the screen
6. Phone randomly reboots
7. If I remove icons/widgets from the home screen they reappear on the next reboot

Does anyone have any information on how to solve this? Thank you!

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