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I picked up my Samsung 32GB from Amazon. Before that I was using an 8GB PNY from Best Buy. So far no problems with either one but I make backups just in case. SD cards fail all the time so I don't think it's just this phone. The thing is when you have a phone as popular as the S3 you're going to see more posts about the issue vs a phone not even 1/4 as many people have.
SD cards have a limited life i found out. when i got my S3 i used the same SD card from my droid x which i had for almost 3 years. then within about a month my SD card showed up blank one day. i only lost about 350 songs so no real biggie. i do recommend using a cloud based back up....