Device unreachable!

after upgrading to the latest firmware, my MyCloud became unstable.
Usually during the sync process, the device went offline, sometimes it was online after a while but in the last days is completely unreachable.
With the UI (http://wdmycloud.local/UI/ with mac) Safari can not open the page because it can not load the page.
If I try with, the device seems offline.
Same result with iOS app.
WDSync as I said before, sometimes works (for a while) sometimes not.
The MyCloud is active on my lan, the front led is blue.
All the apps are to the latest versions.
Before the firmware upgrade, everything works fine.
Thanks in advance.

Mac OS: 10.14.16
iOS: 13.1.2