I have a theory about this. Could you all please check this? I have just sent the following email to my contact at Apple:
Hi Younus,
I may have noticed a pattern.
It would seem that the majority of the music which I am missing is that which costs £0.79. I have spotted in several albums where I bought songs that those which cost me £0.99 are still available from my purchase history to redownload, where those which cost me £0.79 are not.
I hope this will help you get to the bottom of the problem and would appreciate an update when the matter is rectified. In the meantime, I will continue to back up my music manually.
Examples of missing tracks:
"Disarray" and "Easier To Be" by Lifehouse. Purchase number: xxxxxxxxxxxx at £0.79 each are not available for me to redownload whereas "Broken" for which I paid £0.79 IS still available for me to redownload from my purchase history
"Broken Hearts, Torn Up Letters and the story of a Lonely Girl", " 4am Forever" and "A Town Called Hypocrisy" by lostprophets. Purchase Number: xxxxxxxxxxxxx at £0.79 each are not avaialble for me to redownload where as "Rooftops" which I paid £0.99 for IS still available for me to redownload for my purchase history
The album "Rocky Balboa: The Best of Rocky (Remastered) allows me to redownload every track (all at £0.99) with the sole exception of the first track "Gonna Fly Now (Theme From "Rocky" )which is THE ONLY track on the album costing £0.79. Purchase Number: xxxxxxxxxxxxxxx
I don't think is a co-incidence so would appreciate you feeding this back to Apple and seeing if this is a problem in other people's cases as well. If there has been a change in Apple's billing systems or something else this could be what has triggered this issue. This only started becoming an issue for me personally a few days after iOS5 was released so if anything changed at Apple's end around this time this could be to blame.
Could you please update me once you have fed this theory back to the business / engineers?
Thanks,
Mike.