The firm says it is "really sorry" for the problem, which comes on the busy shopping day Black Friday.

From Discovery Communications co-founder John Hendricks, Curiosity Stream is an Emmy-winning streaming service dedicated to documentaries and docuseries. It’s the streaming service for the endlessly curious and, during our Black Friday sale, you can get a lifetime subscription for a one-time payment of $169.97 (reg. $399). Curiosity Stream is home to thousands of films, series, and shows covering everything from astronomy and biology to history, technology, health, and more. Whatever you want to learn about, you’ll find content for you, from creators such as Sir David Attenborough, Michio Kaku, Stephen Hawking, and more. All content is downloadable for offline viewing and Curiosity Stream continually adds more content so you’ll never run out of something to watch. Find out why Curiosity Stream has earned 4.7/5 stars on the App Store. Now through December 3, you can get a lifetime subscription to the Curiosity Stream Standard Plan for more than half off $399 at just $169.97.   Curiosity Stream Standard Plan: Lifetime Subscription – $169.97 See Deal Prices subject to change. Accessories

Black Friday is over but the deals aren't! Our shopping experts have found the best Apple deals right now, including deep discounts on the Apple Watch, MacBook Air, Apple's latest accessories and lots more.