Here’s my suggestion
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Login to the UI and perform a Full Factory Restore (yes you will loose all your data but get a brand new file system so back it up before the restore)
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Login and disable Cloud Service, DNLA, iTunes
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Connect your MAC Ethernet cable to the same router as the WD NAS
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Power off and on your networking equipment
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Transfer files and be happy
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Now try to transfer via wifi
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Report the results to the group
