Not hidden. Stopped working

Decent recorder but definitely not hidden. Red stripe across screen when not in app. It recorded some lectures ok, but now when I go to record the icon indicates it is recording but after a very important lecture there is nothing there. I cant get it to record now, even though it indicates it is recording. Not impressed. Not reliable. Do not buy this app!

Tgy195 about Top Secret Audio Recorder, v1.51