Mine stutters all the time, in playing local files, internet radio, FM radio... I think it has gotten worse since PR1.2 but it was always bad.

It especially stutters when first starting to play a file. First 5-10 seconds of the song are basically ruined.

When listening to audio & some background task happens like checking email, it stutters too. And if you're really doing any real multitasking like web browsing or something just forget about it. It is bad.