Help: Rouge cc or midi data, Reason Rewire Cubase 5

Hope someone can help as this is driving me mad, but for some reason whatever i have open in reason automates on its own,
even if i don’t have reason re wired my midi channel in Cubase vol fader moves every now and then like it’s automating on it’s own. There is no cc data at all apart from velocity in the midi track. Have tried every setting in the preferences in midi and cc data but it’s still happening and making it impossible to work. Any ideas what it could be?