This is an issue I have figued out a solution to and may possibly work for you as well. First let me try to guess the bug that’s causing this. I am an IT technician and over the years I have seen such problems even on windows machines. Such as computers not coming back from SLEEP mode. After your NAS has been idle for a while the drives goto sleep to conserve energy this happens with your windows computers also. Once the drives power down and goto sleep there are times when system is unable to wake it back up. So the solution I tend to use is to not allow the hard drives to goto sleep. I allow the SYSTEM to goto sleep but not the drives. Difference is this: When system is in sleep mode, the processes have stopped and device itself is not running any tasks. When the DRIVES are in sleep mode then it takes a bit longer for system to get responce from the drives when you try to wake them up and if you have a buggy system like EX4, it may not even come back from sleep. here’s a link to my list of solutions for buggy EX4 http://community.wd.com/t5/WD-My-Cloud-EX4/How-I-fixed-some-of-the-problems-post-being-disgruntled/td-p/717044
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