Sounds to be a software problem. Go to a Apple store so they can have a look and tell you what is happening. You can spent hours trying to find a solution and even you find one it might be just a short-term solution and then the problem comes again. Since you have the warranty just talk to them to see what they have to say . Good luck
xxxx. please do not post links to other forum sites . Xxxxxx
xxxx. please do not post links to other forum sites . Xxxxxx
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