Songs that I have purchased are missing in iTunes (file not found/exclmation point), and do not show up in the iTunes Store for download.
I have a laptop that has (or had) pretty much all of my music, both burned from CDs and downloaded from iTunes. My 17 year old son on occasion syncs his iPhone and iPad with this laptop. As of the last sync (as best I can determine), many songs that I purchased in the past few years are now missing, in that they have an exclamation point to the left of the song title, and when I try to play the song, I get an error message that says "The song could not be used because the original file could not be found" or something to that effect. As it turns out, the file seems to be erased. This has happened multiple times, and I could be wrong, but I believe that there are some songs that had the exclmation point last time he synced that now don't, and vice-versa. There is not an obvious correlation or grouping as to why these songs are missing (e.g,. they were not all purchased on the same date, not all songs from one artist are missing, etc.).
Since most of these songs have been purchased through iTunes through my account, my reaction was to go to the iTunes store, log in with my account, and re-download them. Problem is, all of these songs instead ask me to purchase the song, instead of displaying a "cloud" logo. Therefore, it appears that I have to re-purchase these songs, which does not sound correct.
Questions: Does anyone know, most importantly (to get an immediate fix):
1. How can I re-download these songs and why doesn't iTunes Store recognize that I have already purchased them?
and perhaps as important (more of a long-term question):
2. Why does this happen and how can I prevent this from happening again (since it has happened multiple times)?
Thanks.