Welcome to Justanswer.com, my name is Dustin.I'm sorry to hear about the issue you are having, I will do my best to help you resolve it.
We are not from apple, But I have a vast knowledge of Apple and PC computers and everything in between. If I cant help you solve the issue, you will be entitled to a 100% refund.
To get started I need to ask you some questions.
To start with, I need to know the version of mac osx you have on your machine, you can check as follows.Click the apple sign at the top left of your screen, then click about this mac. And then where it says version, send that to me as a reply.
Also, have you installed any major updates or upgrades lately?
And, do you see any strange errors, popups, program faults or anything else?