Onscreen buttons don't always work. What's going on?

[THE-COPS]

NOT hardware keys, but ICON buttons like in menus and in the TouchFlo interface. Lately I've been noticing that when I press my finger on these onscreen buttons or menu options, they will LIGHT UP like you pressed them but NOTHING happens. Sometimes it works fine right away, other times I have to keep pressing the same item over and over. The Icon (or selection) illuminates like you pressed it, but it just acts as nothing happened. I keep re-calibrating the screen but that's not helping.

Sometimes I can press something... such as in viewing a text message. I'll pop the menu open and click on REPLY. The menu closes out and NOTHING happens. I do it again and its fine. Also, this doesn't happen all the time either .. same with the problem above. Anyone else get this ?