bounce to track changes selection start and end
Select something outside of midi clip lengths (say, select an extra bar at the end), bounce to tracks: sonar will then change the selection start and end. So next time you bounce, thinking the same selection is active, you'll get a different location for the audio. Bouncing should NOT change anything about the selection.
I feel sure this problem is the cause of many of the postings in the main forum re "audio tracks moved".