I wonder if it is time to put B/U power supplies on our electronics. It appears that a total drop in source power affects units differently with some just dying and not able to recover from a sudden drop.
I have been thinking for some time about putting my radio, computer, GPS and Sonar on a bu system. Of course that requires the B/U unit to be charged at all times. (maintenance issue) It also requires me to make a power monitor that will shift from pri battery to b/u when the pri fails. This in turn will require some additional electronics to monitor and make a microsecond switch.
But in the long run may be worth the effort of design.
For your particular problem, let us know if you can restore with the bootstrap method or how you fix the problem.
Chuck