you two just up-dated I-tunes
you have Gapless playback turned on (means if the song stays quite for a set amount of time it thinks it as ended so plays the next one) pain in the ass.
Here’s how to turn Gapless Playback off.
1. Open iTunes
2. Select all songs in your library – “Ctrl + A” on a PC – Apple key on the Mac
3. Right Click and select “Get Info” – It will warn you about editing all files
4. Check the “Gapless Album” box and set it to “No”
5. Click “OK” and your files should quickly update
6. To avoid even having to do this….don’t upgrade past iTunes 6
hope this helps you