I have the same issue. All of a suddenly, the H9s are no longer connecting to my app (communication time out). Moreover, the second H9 in my chain no longer instantaneously responds to MIDI commands, but takes a good second to change presets; longer than my first H9.
I have updated both H9s last week to the latest firmware, and had been using it several days last week without any issues. But today, there are suddenly connection issues.
What is going on with your product, Eventide?!