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We couldn't begin to answer your question for lack of info...

Tell us a Story - with a beginning, a middle and end. We need to understand everything that you know and have experienced.

If this issue is new, tell us what immediately preceded its onset - add software, upgrade or update? New equipment?

Quoted from  Apple's "How to write a good question"

To help other members answer your question, give as many details as you can.

• Include your product name and specs such as processor speed, memory, and storage capacity. Please do not include your Serial Number, IMEI, MEID, or other personal information.
• Provide the version numbers of your operating system and relevant applications, for example "iOS 6.0.3" or "iPhoto 9.1.2".
• Describe the problem, and include any details about what seems to cause it.
• List any troubleshooting steps you've already tried, or temporary fixes you've discovered.

For a detailed "coaching", please see the User Tip > "Help us to help you on these forums"<https://discussions.apple.com/docs/DOC-5431>

"Keep It Short and Simple" - Take your time... but be thorough - ÇÇÇ