The thread that @Omgitstony posted the link to is incredibly thorough with many explanatory pictures. 
Definitely worth a look see if you have the inclination and some small screwdrivers. No telling what got into that cam after two years outdoors.
Just double checked, and the IR lights are NOT on when reading the QR code. Also tried scanning the QR code with the protective film still on a new cam - didn’t go well.
One thing you can do that probably wouldn’t hurt at this point is to try reflashing the firmware. It might clear the IR lights issues.
If you try to save it, these two threads also discuss camera lens focusing