Today I exerienced an unknown issue with my Lg g4

[AC Question]

Today as I was taking photos with my camera suddenly my mobile phone stopped working and screen became yellow.After a second it started writing some kind of text(I am sending a picture if it).As the text said I clicked on volume down button to reboot the system.However the restart was unsuccessful.Soon my phone started automatic restarts and it could not start properly.Then I pulled out a bettery and after couple of minutes I placed it back.This time phone started normally.but after couple of minutes I started to experience the same issue.Please help I have no idea what is the metter with my phone. P.S before today the phone has been working properly since I have bought it.