Just to say I was getting the exact same problem (l502x). Many thanks for the answer - on a side note its not just when playing audio/video, the laptop actually hangs consistently, every minute, for 1 second. Obviously its just a lot more noticeable when you have audio playing.
I just think the problem should be addressed at Dell as obviously a lot of XPS users are going to have similar problems and may not be able to find this thread.
I started having the issue today. I followed the advice of this thread and uninstalled dell support assist and dell support agent. Problem solved.
Brilliant.. uninstalled dell support assist and dell support agent and my system is back to working perfectly fine.. thanks for the fix
My wif'e's Dell XPS 17 (L702x) had the same problem starting on Wed Feb-11-2015. Thanks for the great advice. Her problem was an occasional buzz, short, but annoying. I wonder sometimes about updates like this that are sneaked in without any notice.
Thanks a bunch. I would not have figured out this but for yours and the other posts here which supported the claim.
Thank you so much. I had a similar issue with my old XPS 1330 and never solved it. The issue was a reason I wanted to give up Dell. After few years I got my new xps 13 just 3 day ago and yesterday the old nightmare returned. I spent last 4 hours looking trough the Internet and finally got here (even though I could not log in for last 30 minutes).
THANK YOU once again
Check your installed programs. If you did not already have a Citrix client installed, you will find that Dell installed one at the same time that they installed the problematic applications addressed in this thread.