I have this problem sometimes too.
Mines also recently developed a habit of stopping every 20 mins to buffer (despite 15mbit connection being virtually idle), then when it restarts the playback, i get 2 copies of the audio playing – one delayed by about a second. Weird. It’s like some trippy echo effect from Captain Scarlet and the Mysterons.
Also the time now stays permanently visible, sure that used to disappear when you moved the mouse away from the time bar thingy at the bottom.
Edit: Just had a quick search, and some other people are having the same issues as me, double audio, frequent buffering etc. Just in case any body on else has the same problem: Linky