I have had the exact issue as described here. FW 2.10.310 is loaded. Upon reboot, I got the Power Supply 1 failure message, however all drives and diagnostics report healthy. CPU spikes at 92% with no cloud access or backups running. At times I can access the dashboard, but logging our and trying again, the IP address is unresponsive except to a ping. Interestingly enough, upon a reboot, I can back up the files fine. After this FW update, backup performance seemed consistently speedy, however, dashboard performance is sluggish since the change to the new skin.
I have recently disconnected the external USB, per a recent recommendation, but the power supply message persists. I have change plugs, supplies and both run fine. The message still persists.
I believe that there are bugs in thsi FW and really need WD to retest and provide an update. Till then, I’ll keep hobbling along. I bought this array specifically to NOT think about such care and feeding. Till this current FW was published, it was certainly the proverbial black box. WD, please step up, investigate and issue an update!