If the issue occurs, using multiple programs, you may want to reinstall the computer's drivers. The updated Windows 8.1 drivers, for this notebook, are located here: http://h10025.www1.hp.com/ewfrf/wc/softwareCategory?os=4158&lc=en&cc=us&dlc=en&sw_lang=&product=5381181
Was this working before you upgrading to 8.1? This information is something I should know, if updating the drivers does not work. Please provide your results. I'm only here to help!
Mario