Increase Relaxation and Increase Alertness sessions

Hey guys! I utilize the Increase Relaxation and increase Alertness sessions daily and feel they really do make a difference. However, I feel like the last few days my stress score doesn't increase with the alertness session as much as it did or even decreases. Has anyone else noticed this? Is it a change in firmware? Am I needing to adjust the session because I'm improving? How have you all changed your sessions to match progress?