I make QFeedbackHapticsEffect object:

effect = new QFeedbackHapticsEffect;

Later I do effect->start() in mousePressEvent.
And finally "delete effect;" in main widget destructor.

But after I click "Exit" application is closed but memory not released and I see my app in process list in Y-Tasks. And OS indicate to me that app is closed. So I can launch my app several times and it eats a lot of memory.

On other side - when I use "QFeedbackEffect::playThemeEffect(QFeedbackEffect::ThemeBasicButton);" instead of making my own object - everything works fine.