IPad 4G 16GB in stand-by shows lockscreen every 10-60 seconds

Hello
We've just purchased 5 new iPads 4G 14GB for business use. They all are configured from the same backup with completly identical Software, every iPad with iOS 5.1.1.
One of them continiously show's the lockscreen every 10-60 seconds for some seconds, if it isn't connected to a power supply. I've tried many things, turned it in Flight Mode, tried to find something in the console-log, tried to reboot, then tried to reset it with Home/Sleep-Button, removed the case, changed location (I'm now 25km away), disabled «iPad Cover Lock/Unlock». All apps in Notification-Center are disabled.
I also think, that this behavior was BEFORE I made any change on the iPad, in factory mode out of the box.
Hope anyone can help me… :-)
- Martin

By it's very nature, 5G is not as reliable as 2.4G, especially if you're transmitting through walls or, worse, ceilings/floors.  What is your objection to using 2.4G?

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