I have a Tech21 Midi Mouse controlling my H90 via standard 8 pin DIN midi cable (with index offset applied so the numbers match the H90 program numbers), and on occasion the Midi Mouse suddenly no longer controls the H90 -like the H90 wont page up or down from PC commands from the Midi Mouse -However -control is still available via the H90 itself and the H90 program is still affecting the output audio -so the unit is not totally locking up -a reboot of the H90 fixes this every time -which is why I suspect it’s on the H90 side -as the Midi Mouse is about a simple of a Program Change unit as there is.
It doesn’t happen often (maybe 3-4 times total in the last 6 months) but it’s a bit terrifying as I don’t like pedals in front of me (except Midi Mouse and Tuner) and my H90 sits back at the amp out of site a bit -so if the control goes dumb during a show even every once and a while it would be a disaster for me.
Currently I am seeing this issue on Software 1.5.7.220 Factory Pack 1.5.7.220 OS 1.5.7.220 Audio 1.875. Panel M:1.415