What causes 8310 network to turn off

It doesn't happen often, but every once in a while I'll notice there are no e-mails and the signal display is no longer visible. When I check the network connection (AT&T), it's off. What might be the cause for this?

This has been an issue for quite some time across all devices and carriers.  As long it's not happening that often I wouldn't worry about it.  Just turn it back on.  Do make sure that your device's OS is up to date.  Check with your carrier for the latest handheld software for your device.
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