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We would suggest that you restart the system (tablet) by holding the power button.Once it restarts check if the same issue happens.
In case the same issue happens try the following :
old Power-Button 10 seconds to shut off Dell Venue 8 Pro
Push and hold Power-Button and then push and hold Windows-Button
-- Dell Logo appear.
-- Options appear on the bottom of the screen: F2/Volume-Down = Setup. F12/Volume-Up = Boot option. .
Push Volume-Down-Button = Setup
-- It trys auto repair, but it cant find a fix
Tap on:Advance options
-- Youll get the options to reboot,use a device, trouble shoot,or turn off pc,
Taped on: trouble shoot
Selected to option "Refresh your pc"
Kindly let us know if this works.
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