we have 18 3020's recently upgraded from 9.0.9 and all are OK so not sure what the difference is with yours.
just downloaded both 9.10 and 9.1.6 and then installed 9.1.6.
we have a mixture of SA and HA all managed by panorama and most are GP gateways but all went well.
I know that doesn't really help you but must be something else going on here... what version were they on when you upgraded?
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