can't answer phone if slide screen disappears

[LindaSB12]

I have to call back about one out of 3 callers because when I try to slide the answer button, something goes wrong and the screen to answer disappears without answering the phone. the phone continues to ring, but I can't answer it.
1) Is there an app to change the answering options?
2) is there a way to get the slide screen back so I can answer?

I'm on android 2.3.6 (if that makes a difference.)

 

[Devinator]

Has the phone always done this, or, did it just start randomly happening?

 

[LindaSB12]

It has always done this. At one point I downloaded an app to show area code locations and it became worse so I uninstalled that app. so actually 1 out of 3 calls missed is better because with that app, I was missing 2 out of 3.

 

[Devinator]

A couple of things. When you say disappear, do you mean the display turns off? Or is it displaying some other screen?

If the display is turning off, not sure. That's definitely not the way it should function.

How old is the phone?

Are you running a custom ROM or is it stock?