Why do some songs skip over on my iphone?

Itunes/my Iphone is really starting to tick me off.

I had tons of music on my Itunes library also in sync with my iphone. Then my computer crashed and i lost all my memory. I purchased a couple news songs on Itunes, and it deleted all my old music when I added the new songs I bought '

However, now I downloaded all of the songs from Icloud that I purchased from Itunes before, but when I play the music on my Iphone, a few songs randomly won't play and they just skip over… Why is this?

Ipods and iphones have a setting where when you shake the device it will go to next song, you probably shake it at times and it changes song

This is about copy right laws which in my opinion has gone overboard by these companies that let you download their music. My guess is by your computer crashing you lost the original copy right place your old music was recorded to and your old computer is what itunes is expecting to see. Instead it is seeing another source and that new source itunes does not recognize. I had the same problem, not like what you are experiencing but similar. I recorded purchased download music to a CD for my car using win 7. When I played the CD in my car only about a forth of what I recorded played. I looked into this on the net I found out it had to do with copy right laws. I got around this buy installing Windows XP on another hard drive and using third party software in XP I was able to record my desk and play all my music in my car.

My point? Do not ever get rid of your old original CD music, I do not care how many of these so called experts say the music CD is dead, one day the music CD will be gone and when it is we will be at the complete mercy of these people. Very scary.