WASHINGTON, DC (WUSA) -- Tablets top many gift-giving lists this time of year.

And before you head out to shop, Consumer Reports wants to alert you to one that is plagued with problems.

Lab tests found that the tablet regularly locked up during use.

Testers set up a camera over the tablet to show what happened when an app ran a slide-show of news headlines.

In the time lapsed video, the slide show stopped suddenly and the screen went blank.

"We tested three Monster M7 tablets and the screen froze or went blank on each of them. Sometimes, it happened in less than an hour, other times it took several hours for the screen to freeze," says Dean Gallea.

Although testers were able to restart the tablets to clear the problem, but it happened again.

Consumer Reports has named the Monster M7 a "Don't Buy."

If you already have the tablet and want to return it to Walmart, be aware that they have a 15 day return policy for tablets.

So, you may have to demand your money back.

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