Hello tecsi12,
If I understand correctly you had a movie downloading and anything else that used Wi-Fi wasn't able to access the internet, and you were also unable to pause the download. That seems like unexpected behaviour to me, so I would start by quitting all the running apps on the iPad:
Force an app to close in iOS
1. Press the Home button two times quickly. You'll see small previews of your recently used apps.
2. Swipe left to find the app you want to close.
3. Swipe up on the app's preview to close it.
When you have done that restart the device and test the issue again:
iOS: Turning off and on (restarting) and resetting
If that doesn't resolve the issue in the future, the only other thing that I can think of is that perhaps the networks settings on the device may need to be reset:
Reset your Network Settings. Tap Settings > General > Reset > Reset Network Settings. This also resets Wi-Fi networks and passwords, cellular settings, and VPN and APN settings that you’ve used before.
From: If your iPhone, iPad, or iPod touch won’t connect to a Wi-Fi network
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