IIIIIIIIIIIIIIIIIIIIIIIII am getting realllllllllllllly odd echo o o o o s

It is almost only on videos but I did notice it on an audio book too.
I am thinking that it is involving a problem with buffering, but it lasts about 5 seconds and then seems to catch up with the video and/or time slider.

It only recently started happening, like with the most recent iTunes update, but I have also bought a new PB, so it could be a PB issue.