If I go to http://radio.dos.nl/ and play one of the radios the sound is not smooth, it pauses every 1-2 seconds. I can reproduce this with the MiniBrowser, using WebKitGTK+ 2.16.5 in Debian, using gstreamer 1.10.4-1.
I was reproducing this in Ubuntu 16.04 last week with a build from a few weeks ago. From nightly build on Fedora 25 with MiniBrowser, I can no longer reproduce it.
I can't reproduce this issue with webkitgtk 2.18.4. Closing. Feel free to reopen if this ever happens again!