I was just reading some of these.
There are a few of these problems but no one else admitted that the phone got wet and dried out when this started.
Anyway mines been like this for 2 months since it go wet. It was also jailbroken but I really don't think that has anything to do with it.
I got put in the swimming pool with it in my back pocket. No other issues after it dried out.
I just upgraded to 5.0 iOS software upgrade and my light just went out. Hope it stays out but this is the 1st time it turned off.