Why won't swiping to answer calls work on the LG K4?

When I receive a call I try to answer it by swiping across the screen - nothing happens, so then I try tapping.  And I'm tapping/swiping to answer the call, sometimes I lose the call.  Same thing when I end a call, it just won't hang up.  I have to wait for the other person to hang up.

Were you tap, hold, and swiping the green phone icon?

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