iTunes is only playing the first few seconds of each song
I've searched high and low and cannot seem to find a resolution to my problem. When I'm listening to many of the songs in my library, iTunes will just stop playing and move to the next song after about 10-15 seconds. If I slide the progress bar at the top, the song plays from that point on for a few more seconds and skips. It seems that many people have had this trouble throughout the last few years, but in each of the instances where I've found someone talking about it, there is never a solution. The discussion just goes cold. I've tried checking the start/stop boxes for an affected song, but they won't stay checked. Any help would be greatly appreciated!
Thanks
Windows 7