RE: Distorted audio on XPS 13
I have the same issue. It occurs when I've had my laptop on for about 8 hours.
I don't use headphones or speakers so its purely happening from the internal speakers. It gets worse and worse over time, until you reboot, so must be a software problem? I've updated my drivers repeatedly and ran all the dell updates when prompted.
A reboot works, but it's really not ideal. I've been looking for an answer for this for some time, its disappointing for such a high quality laptop and when I come to replace the laptop, I will have to look elsewhere unfortunately.