LG G2 - Cannot answer incoming phone calls, why?

[AC Question]

LG G2 - Cannot answer incoming phone calls

My LG G2 android touch screen is failing. Incoming calls cannot be answered. After 1 1/2 to 2 rings, the call automatically goes to my voicemail, without touching the phone. If I am working in an APP and an incoming call comes in, I can answer the call, but only then.