I noticed my D9 slowed down to around 2.0Ths poolside about a week after the firmware update. A reboot seemed to fix the problem and it's back at 2.3Ths on Coinmine.
Did you notice if that board is heating up higher than the others?
Actually all of them are in the same zone of 62-69. I have 2 D9's, both upgraded, and both were absolutely smooth, then all of a sudden its been 4 days and this one board is just acting up. I thought someone else also had similar issues. Tried reinstalling the firmware, still didn't help. Gonna try resetting the machine.
Tried Inno support skype id, but no body replies it seems.
on setting you use performance setting ? maybe its that .