What happens if you unplug the MIDI cable before turning on the MIDI controller ?
What kind of MIDI controller do you have ?
I have the Voodoo Lab Ground Control Pro and if I "forget" to turn it on, or find out
I want to use it after a while ( in the studio ) I plug MIDI cable in after turning it on,
otherwise it sometimes does not work properly or KPA acts strange ....
But most of the times it works flawless ....... ( Knock on wood )
Cheers !