Multiple problems. Phone is probably doomed.

[ch3micalrainb0wz]

A few days ago, I was charging my LG G3, I attempted to open YouTube. Phone restarted itself and wouldn't connect to the WiFi when it came back on. Wouldn't even pull up the menu. Tried factory reset, didn't fix. Now the battery dies super quick, random restarts are more frequent. When it restarts itself, stays stuck on start up screen until I remove the battery and physically turn it back on. Also has some issues detecting the SIM card, even when it does, my data sometimes doesn't work. I've tried a few other things like running in safe mode and turning airplane mode on and off.

Any suggestions? Or is my phone just doomed?