HP Probook 4530s Audio :: Sound Sometimes Won't Play - Windows 8.1 (64-bit)

I'm having an issue with my HP Probook 4530s where sound sometimes won't play. I downloaded the approriate audio driver for my computer. If I click on an application that needs administrator permissions and the User Account Control pops up, it won't play the system sound like it normally does. If I click on the speaker icon on the bottom right and adjust the volume slider it doesn't make a sound. I've also noticed that when I stream any type of video on the internet, the video won't play until the sound works again. Sometimes the video plays with no sound, then the sound catches up. I've tried many different browsers but the issue keeps happeneing regarless.
 
When my computer ran Windows 7, the audio worked fine. Videos always played, and system sounds always executed on cue. My motherboard got replaced at the end of last year due to overheating so I don't think it's a hardware issue. The weird thing is that this issue isn't consistent. One minute the sound could be working flawlessly, but two minutes later the sound just stops working.
 
I could try and capture a video of the issue I'm having and post it on Youtube, but it's difficult since the issue is sporadic. If I do get a video of it, I'll be sure to post the link.