Novation Twich and dj pro

Help. I set my novation twich with dj-pro all the mapping are fine and tested for 2 channels, I have a big problem I can’t figure it out: If I don’t use dj pro for few days when I turn it on again the midi mapping of the left channel doesn’t work anymore. Everything seems to be fine in the dj pro midi page all the mapping are there…it just don t work… any help?