Personal Hotspot Wi-Fi AT&T iPhone 4 Disconnecting Periodically

Greetings!
I have an AT&T iPhone 4 that I'm connecting to either a new 13" MacBook Air or iPad 2 via the Personal Hotspot Wi-Fi connection. I have the requisite plan from AT&T.
I can stay connected for various lengths of time, usually ranging from five minutes to forty minutes, until the connection is dropped between the iPhone 4 and whichever device I'm connected to.
When this occurs, the only way to get it connected again is to turn off the iPhone 4 and then turn it back on again.
No matter how many times I toggle the Personal Hotspot on or off and/or the Wi-Fi, the SSID is no longer seen on any device.
Usually when I reconnect, after I've power-cycled the iPhone 4, I am again prompted for the Personal Hotspot's WPA2 key.
Neither the 13" MacBook Air or the iPad 2 exhibit this behavior on other Wi-Fi networks (I haven't tried using anyone else's Personal Hotspot).
I have reset the Network settings to no avail.
Has anyone else experienced this particular issue, and if so, did you find a solution?
Thank you.

I think you are running into the following issue.
From: http://support.apple.com/kb/TS2756
Note: If you leave the Personal Hotspot screen or put iPhone to sleep, iPhone only broadcasts the Wi-Fi network for an additional 90 seconds. If no devices join the Wi-Fi network during that time, iPhone 4 stops broadcasting your Wi-Fi network. You can start broadcasting your Wi-Fi network again by tapping Settings > Personal Hotspot.
So, if I understand correctly, if you leave your iphone on the the Settings --> Personal Hotspot screen, than it shouldn't stop broadcasting.

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