I've had the same odd freezing, it would lock up with the sound on a loop for a minute or two, then work fine again for a minute or two, then freeze etc.
Well, turns out it was my antivirus programme. I use "Avira AntiVir", with the guard always on (scans everything going on continuously, background scan) and the detection settings set to "paranoid". Anyway, once I disabled the guard protection everything ran swimmingly. Just disable whatever you use and give it a shot.