thanks for the information barddzen, it sounds less likely to be the upgrade, (as that has been known to cause more immediate problems for some) but it might be some hard drive issues that are causing the reboot loops, possibly more than 1.
would you be able to try powering all off,
and then unplugging the power to drobo, and computer connection cable
and then removing all drives (remembering the order)
and then powering up just the empty drobo
(does it boot up and then go into standby mode?)
if so, please can you power up the computer
and then connect the comuter cable backinto drobo
(does it wake up shortly after, and then does dashboard recognise it as empty?)
if so, please can you shut down the drobo and computer
and remove power and connection cables from drobo as before
and to then put all drives back into where they were (these are your disk pack) still while power is OFF.
to then power up the drobo on its own
(does it boot up with the blue leds as usual, and then go into standby mode?)
if so, to then power up the computer
and then to plug in the connection cable back into drobo
(does it wake up, and then be recognised by dashboard, and “hopefully” be accessible again?)
in case not, there are some more things we can try but how does it go with the above?