Check the songs in your normal media player, not LW's media player. LW puts most of its energy toward searching & dwnlding so the media player can suffer at times. Skipping is a common problem on the windows platform for LW's media player. If you don't have another player, may I recommend QCD (free) which has all codecs necessary to play all media types built in:
http://www.quinnware.com/ If the problem does turn out to be LW's media player, perhaps you could use your own mp3 player instead by disabling LW's media player under LW's menu Tools-Options & Player & unticking the option box. That will force your default mp3 player to play instead. Apparently LW 4.2 when it's released is supposed to have some improvements for the media player. Oh & if the songs don't play properly in another player, chances are they are corrupt. Careful about dwnlding from T3 sources. They're known to offer corrupt files.