Windows: QFileSystemModel blocks application

Set-up:
-QListWidget manually populated with all volumes present on the system and some user favourite folder.
-When that one is clicked, it will set the "setRootIndex" with the file model (QFileSystemModel) to "setRootPath(path)"
-The QFileSystemModel is initialize with those filters:
QFileSystemModel::setFilter(QDir::Files | QDir::AllDirs | QDir::NoDotAndDotDot | QDir::NoSymLinks);

What is happening:
Randomly, my application will block until I press pause and then continue within Visual Studio. When Pause is pressed, it's look like the app is waiting for that function to finish: "SHGetFileInfo(reinterpret_cast<const wchar_t *>(filePath.utf16()), 0,&info, sizeof(SHFILEINFO), flags);" (from QWindowsTheme.cpp) with filePath, in my case, equal to "C:\work\Test Footage\."