I have now received both s3's back from the repair centre, but the CPW assistant has told my wife that no details of what was actually done to fix them was given - really disappointed with that. Glad to have them back though, but worried what caused the problem in first place.
I know when I had my previous phones (HTC Desire's) I'd played around with different ROMs, etc on both units to get a better experience (actually ended up on Gingervillian 3.3 to get aps2sd and loved the battery life too!) - Fortunately, when I got these S3's I had no need to root them because they did everything I needed them too -
SO HERE'S MY TWOPENNETH OF FRIENDLY ADVICE
With the experiences people are having with these going dead I would urge people to really think twice about rooting etc until the cause is determined and remedied, because if you find yourself in a similar situation to the many (and growing number) of effected users and you send it back and they tell you the warranty's void then there are going to be some very very very unhappy bunnies around (I would have cried to have to pay for two to be repaired :crying
GL all with getting your devices back - let's hope Samsung do something about it asap