I’ve had four hashboards dying on me now and it’s only been a week since I’ve set up surely this isn’t normal?
That's pretty bad better check the control board model first before trying to flash it through the SD card if you flash it with the wrong firmware it may brick your unit.
I suggest check the control board and only use the Phoenix tool that they provided.
Also, check the SD card you use and maybe that is the reason why it dies some fake SD cards when burning firmware it turn corrupted. So make sure you have an extra SD card and make sure you are using an authentic SD card.
Also, try to disable the Antivirus and maybe your AV restricting Phoenix tool from burning firmware it sometimes corrupts the data from the image detected as a mining virus which we know false-postive.