Mm… this also happened to me a couple of times but I didn't think too much of it. Upon start up… my H9 read "No Algo". but once I started the Control App on my iPhone and selected a preset, everything works fine. 

I am using a Ground Control midi controller with my H9 as well then to the EVH 5150III 50w for channel switching. I am powering the H9 with a Voodoo Lab Pedal Power ISO-5 in (9V 400mA) with no issue. Other than the two times "No Algo" display during start-up , the H9 has been working great and I'm very happy with it