Others have had this issue on other Samsungs. It happened to me last night on the Captivate. I tried battery pulls, deleting the wifi nets, etc., but it still kept turning wifi off within a minute of turning it on. I did a factory reset (I'm getting better at this process -- can restore my device back to its former glory within an hour ) but its still a massive pain in the ass. Anyhow, just in case you experience this, it clearly is not a hardware issue.