Several universities have reported this.
Apparently there's a bug in the DHCP client, causing it to keep using an old IP address if it expires while the tablet is asleep.
Princeton University's explanation of the problem
Princeton's IT department automatically looks for this IP mistake, and after it happens several times, locks out the device.
About half of the iPads on their campus have been locked out because of this bug.
Apparently there's a bug in the DHCP client, causing it to keep using an old IP address if it expires while the tablet is asleep.
Princeton University's explanation of the problem
Princeton's IT department automatically looks for this IP mistake, and after it happens several times, locks out the device.
About half of the iPads on their campus have been locked out because of this bug.