Streamed from Network means use of samba or nfs which means a block of non fragmemented ram is required and the drivers of dmm do not cover that properly with >=3.0 kernels..... use local harddisk instead.... when watching mkv files via this box it guaranteed will fail after a while.
So I put an mkv on the local harddisk. Instead of freezing after 5-10min, it did so after 10 seconds... doesn't seem to be a solution either.