Couple of suggestions. First is to assign the My Cloud a static IP, if you haven’t done so already, through your network router’s administration page.
Second, because you indicated you are using Windows 10, see the following link if you haven’t already and check/see if the suggestions in there help. In particular Windows 10 Specific Method 1 through 5.
https://community.wd.com/t/compilation-of-windows-10-methods-steps-and-solutions/142576
