I listen to I-heart radio stations via Internet Explorer launched from the 'tile' page. If I switch to another application - eg Excel - the streaming stops until I return to IE. The same happens when I switch to some, but not all, other web sites. If I launch IE and I-Heart from the desktop view, these issues do not exists. Any ideas why I am experiencing these issues and they can be fixed, please?

Running: Dell XPS 8700 64 bit, Windows 8.1