One Samsung Galaxy S III owner whose phone passed away, speculates that the NAND is becoming corrupted which ends up with it failing. Samsung is said to be aware of the issue, but has yet to comment on it. While Sammy has played "mum," some working in the Samsung warranty call center have heard of the problem, saying that it has happened a lot lately.
There's speculation that the NAND is becoming corrupted and failing. Worryingly, Samsung are replacing the mainboards with the same revision so this may just be putting the problem off for another 6 months or so.
It happened to my S3 last week and I've never rooted or installed anything other than the official 3UK Samsung firmware, first ICS then JB. Samsung haven't officially acknowledged that there's an issue, but both the guy I spoke to in the authorised repair centre and the chap in the Samsung warranty call centre have said they've seen this issue a lot lately.
Tl;Dr - S3 mainboards dying for no reason, Samsung replacing mainboards for free, but no new hardware revision so it might just happen again."-Post on Reddit
Have any of our loyal readers suffered through this experience with their Samsung Galaxy S III? One minute it is a working high-end smartphone powered by the latest technology obtained by Samsung, and the next minute it is a brick. Let us know how it happened and whether or not Samsung took care of you by sending out a replacement.
source: Reddit via AndroidAuthority