Midi instrument track loses connection to bus - drops in volume

Hi.

Im using XLN Addictive Drums in multi mode (stacked track to aux) and sometimes when selecting the track it drops in volume = the tracks within the stack track is sending to the master aux, but the aux seem to receive a "different" signal. Signal not visible on the track meter, im not able to adjust volume on the low signal, the volume is much lower than it should be and the only thing I can do is solo, mute and unmute.

this has occasionally happened on stock instruments as well when stacking sounds within a stack track.

this happens about 40-60% of the time

The only fix that I've found is to close the project, load it up again and NOT touch the track with this issue (when chosing the track, it seems to snap out of order again.

Has anyone else experienced the same / know a solution to this?