Mostly a freezing problem on some files. Have to say these are all video files encoded in DV and HDR. It will strangely enough freeze on same point. Now I have an older Zidoo Z 9 S. There of course I am forced to play the file in HDR. No problem at all , no freezing. My firmware was 6462. I upgraded tonight to 6465. Nothing changed. also got often problems of not playing ISO files, and some remuxes, that stop after an hour when the sound goes on.