Buffering issues since 12.0, even with local files

Hi,

my HTPC is based on an Athlon 4850E dualcore processor under Win7 x64, and a Radeon 5670HD graphics card, this system is not a rocket, but it is smooth and capable of playing back all kind of media without any trouble, normally at least.

Well, since I switched my setup from XBMC 11.0 to 12.0, I suddenly have a lot of buffering issues. My network is gigabit, and I get around 100MByte/s in real-life benchmarks, and buffering occurs with local files sometimes also: the video stopps, and XBMC displays a buffering progress bar. It even happens with very small files like SD-mkv files, and most recently it happened even with Music (FLAC-files), no buffering bar there, but the sound stopping for some seconds and then continuing.

I already tried to analyze the log files, but find no entry at that specific timestamps.

The rest is totally smooth, and I love XBMC, but these buffering issues drive me crazy. Happens around one or two times per hour, sometimes more often, sometimes not so often. I have already checked for other processes running, but there is nothing in the background, not even an antivirus software or anything similar

Any ideas? Thanks a lot.