One of Gallup's Q12 engagement questions has nothing to do with targets.
It asks whether your supervisor, or someone at work, seems to care about you as a person.
For a rep who spends most of the week alone in a car, that someone is usually the first-line manager.
In my experience, a sudden drop in energy is rarely about the product or the territory. Something has changed at home. A sick parent. A new baby. A move. Money worries.
What I have learned to do:
Notice the change. Shorter answers, quieter debriefs, less energy on calls.
Ask in private. "You seem a bit quieter lately. How are things?"
Do not dig. Open the door and let the rep decide how much to share.
Listen, do not fix. Most of the time they do not want advice. They want someone to know.
Adjust what you can. A lighter route for a few weeks. A moved field day. A more flexible week.
Keep it private. What a rep tells me stays with me.
Know where HR can help. Leave and support that already exist are useless if nobody mentions them.
Then check in again a week later. That second question is the one they remember.
“A rep carrying a worry nobody asked about cannot give you their best.”

Lesson 6 of 19 in Step 5: Motivating and building the team, with the full guide and a checklist for this week.