Sound cuts out after any given amount of time, only way to turn back on is to reboot.

For reference, I am using a fully up-to-date mid-2012 model rMBP. Attached to my MacBook via USB I also have an M-Audio KeyStation 49i, which is where I have my headphones plugged in (probably not related in any way, but just noting this).
I first encountered this issue while using Chrome and listening to music on SoundCloud with Garageband open after the last Mavericks update yesterday. I initially thought it was a Chrome bug, and in doing some research, I found that other Chrome users were having the same issue as me, but it was related to PepperFlash (a version of the standard Flash player), and disabling it in Chrome Canary fixed the issue for them.
Unfortunately, it did not fix the issue for me, but I have refrained from using Chrome since then and stuck to Safari to ensure that it's not two issues with the same outcome.
Then I stumbled across all of the Mavericks users that are having sound problems; anything from crackling/popping to not working at all. It seemed, though, that everyone that was having the sound cut out for them entirely were not only having this happen after their laptops came back from sleep mode (which is not the case for me), but were able to fix it by restarting Coreaudio[d] or -- if they had been using the headphone jack on their Macs -- they just had to plug it in again and take it back out. Neither of these worked or were applicable to my situation. Some were able to get it working again by resetting the PRAM/NVRAM, and a few others seemed to be able to bypass the issue by using Soundflower, but neither of these solutions worked for me either. The only way I can get sound to work again is to restart my computer entirely.
After doing so, I am only able to listen to audio for a certain amount of time. It seems to vary depending on how much memory the task is taking up. Like I'll be able to listen to a track or two on SoundCloud, or attempt to record into Garageband for five minutes or so. If I'm in a Garageband project that already has a lot of tracks, I'll be lucky if I can even get through a few seconds before it cuts out entirely. There are very quiet crackling/pop sounds every once and awhile, but it is hard for me to distinguish if that is just the natural state of the hardware I am using or if it is related to background system sounds.
I'm at wit's end trying to figure out what the problem is, mostly because there are so many others with similar issues and varying hardware/software setups that it's hard to track down exactly what my own situation is.
I'd like to know where I should be exporting any error logs from so that someone can take a look at this issue.
Thank you.

After doing some additional testing, I was able to get the sound working again without rebooting by:
1. Unplugging the MIDI device.
2. Resetting the audio input and output to "built-in".
3. Plugging back in the MIDI device.
4. Changing the audio input and output back to the MIDI device.
Still, though, the sound only lasts for a little while, and there doesn't seem to be anything indicating how or why it stops.

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