• Apple's data centre is very reliable, although it isn't perfect like any other data centre. Servers might go down for a variety of reasons. The telecoms provider that connects Apple's data centre to the Internet occasionally has issues. High volume can sometimes overwhelm servers, making access to the iTunes Store difficult.
• Fortunately, checking the system health of every Apple service is simple. To see if the service you require is operating, go to the Apple System Status web page. This page shows the current status of all Apple services, including the iTunes Store, iCloud, iMessage, Siri, iTunes Radio, the App Store, and many others.
• A timeline of previous issues is also available on the website. If the service you're using has a problem, you'll have to wait until it's rectified.

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