DO NOT DISTURB was in effect.  I couldn't get wi-fi connection until I turned DND off.  Is that a bug or to be expected?

I just started using DO NOT DISTURB at night but needed to send out an email.  Was surprised that wi-fi had shut off. Couldn't re-connect until I turned DND off.  Then wi-fi connected immediately.  I hope this was just a temporary glitch.

Resolution
If you encounter this issue, try the following steps and attempt to enable Wi-Fi or Bluetooth after each one.
Verify that Airplane Mode is turned off.
Update your iOS device to the latest version of iOS.
Reset Network Settings. To do this, tap Settings > General > Reset > Reset Network Settings
Restore your iOS device in iTunes.
If you are still unable to turn Wi-Fi or Bluetooth on or off after attempting these steps, contact Apple or your wireless carrier for additional assistance.

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