What to Do When Your Best Employee Suddenly Starts Underperforming
A sudden performance decline in a previously strong employee is different from a chronic underperformance problem, and it requires a different response. When someone who has been reliable suddenly is not, the drop in performance is almost always a symptom of something rather than the root issue. Your first job is to understand what changed before you decide how to respond.
Start With Curiosity, Not Consequence
Resist the instinct to go straight to a performance conversation when the issue is sudden rather than chronic. A high performer who has abruptly changed behavior is usually experiencing something, whether that’s a personal situation, a work environment change, a problem they have not told you about, or a disengagement signal about the role or organization.
Your opening move is a direct conversation that leads with curiosity: 'I have noticed a change in your work over the past few weeks and I want to check in. Are you okay? Is there something going on I should know about?'
The answer to that question determines everything about how you respond next.
What the Drop Might Signal
Personal situation — health issue, family crisis, or personal stress that is affecting concentration and energy
Burnout — particularly common in high performers who have been carrying significant load without adequate support or recognition
Disengagement — the employee is actively looking for another job, or has mentally checked out due to a frustration they have not voiced
Relationship issue — a conflict with a colleague, a perceived slight from leadership, or a feeling of being undervalued
Role fit — the role has changed in ways that no longer align with what the employee is good at or interested in
Something you did — your own management behavior may have contributed to the change
None of these are excuses for sustained underperformance, but all of them are better addressed directly than through a performance improvement framework designed for chronic underperformers.
After the Conversation
What you do next depends entirely on what you learn. If there is a personal situation, discuss what support or accommodation is possible and set a reasonable timeline for re-engagement. If there is a disengagement issue you can address, like a role adjustment, a recognition gap, or a management change, address it directly.
If the employee is actively job searching, the performance decline may continue regardless of what you do. In that case, begin thinking about continuity planning while keeping the door open for an honest conversation about whether the role is still the right fit.
When to Shift to Formal Performance Management
If the performance decline continues beyond four to six weeks without a clear cause being identified or addressed, shift to the same progressive discipline and documentation process you would use for any performance issue. Acknowledge the change: 'I know things have been difficult recently. And I need to be direct with you. The performance issue needs to be addressed regardless of what is going on outside of work. Here is what I need to see change.'
Compassion and standards are not in conflict. You can (and need to) hold both.
Get a Performance Improvement Plan Template
When a performance conversation needs to escalate to a formal documented process (for any employee, including previously strong ones), our PIP template gives you the structure to do it correctly.
Editable Word document + PDF. Instant download. Created by a SHRM-SCP certified HR professional.
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