Ogg files freeze up my 2gb Clip!

I’ve having difficulty getting my ogg. files to play - they simply freeze up the Clip requiring me to hold up the power button for a LONG time in order for it to reset.  I’ve removed the album art in the files, I’ve cleaned the tags and re-tagged, all using mediamonkey.  The files were converted from tagged wma lossless files into 160kb ogg files with mediamonkey and the resulting files play fine in mediamonkey.  Any ideas?