MIDI Connection not always persisting across session

Greets, I just noticed this particular session I've been working on (.qtr file) is not always persisting the MIDI connection between my controller and Qtractor. Not a big deal obviously since I can (and do) reconnect it using the MIDI Connections window. Just figured I'd mention it since the problem is intermittent. Version: 1.5.6.9git.3e2525 Take care.