Why do I loose 4G service when the iPad 3 wakes from sleep?

I just upgraded my original iPad to the new 3rd Generation version. 64-gig with wifi + 4G. I've noticed that when the device goes to sleep and I enter my code to unlock it, there is no indication of celular service status. I get full bars followed by the ATT logo but it's blank where the 4G usually shows up. If I try to go online or get email or run an app that requires a connection, they always fail.
I have to turn off the iPad - wait a few seconds - then reboot the iPad. It will go through the "Searching" phase, then I'll once more get the full bars follows by ATT followed by 4G. At this point, everything works again.
Second issue - The left hand side of the screen appears "puckered" in that there are faded areas in and out - like a book that's been bound too tightly. If you adjust the magnetic cover a bit, it sometimes goes away. Not always - and it always comes back.
Third issue - it tends to run hot after a half hour or so of use.
Hope someone has a fix. ;o)
* Ron *

Yes, I am having the same issue. Cellular connectivity goes out whenever the device is put to sleep or switched to a WiFi network. I have to go into Settings -> Cellular Data and turn that off and then back on. It instantly starts working again.

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I've a problem that is slowly getting more and more frequent.
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Why do I loose 4G service when the iPad 3 wakes from sleep?

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