My husband has a LG K20V. In the last week or so, Quickmemo+ repeatedly pops up on his locked screen. It opens up briefly and then disappears. We have done a system reset back to factory settings, and it still persists. We cannot disable the app (that choice is grayed out).
Solved! Go to Correct Answer
So, who would have known that holding down the side volume button for an extended period of time would trigger Quickmemo to appear on the phone? It turns out that our problem was caused by the soft case material being pinched by the hard outer shell, resulting in the side buttons being pressured. The problem has disappeared since I uninstalled the case. Sorry for all the bother.