Well this has happened to me now four times in total

Black Screen, no response from power or home button. Home button warm/hot to touch. Plugging the phone into the mains has no effect. Holding home and power button to reset brings the device back to life. Spoke with apple support today regarding this including the sending of a short diagnostic report from the phone which they say shows nothing

..... Apple support suggested I perform a restore from iTunes and restore a backup. My concerns are that my return date for a full refund is 9th October, if its a hardware issue then I don't want to keep the phone, if it's software then I can survive providing we all get a fix. Surely we have a genius in the forum who can help with this so we can go to Apple and get some answers