Premiere cc 2017 only loads half of audio clips / audio is choppy

Hi, I'm working on a project in Adobe Premiere Pro cc 2017 and I'm trying to put some background music behind my footage, but when I open the audio files in the source monitor or place them on the timeline only half the clip is loading. I've let it sit for a minute to see if the other half will load, but to no avail. This is happening with every audio clip I try to open or play. The audio is also pretty choppy when I put it onto the timeline, but this could be due to the multiple video layers I have going on.

I've tried saving, closing, and restarting the software, but this didn't seem to change anything. Any help?

Thanks,

Keely