There's some trouble shooting help in the H9 Control manual:
The first thing I try when I'm having trouble is I reset its system settings by turning the H9 off and then turning it on again with the right footswitch and the HotKnob switch pressed (the switch in the upper left hand corner of the H9). This will clear its system settings but won't affect your presets. If this doesn't help, please try some of the other steps mentioned in the manual. If you continue to have problems, let us know.