The team’s PERFORMANCE is not just related to a single EVENT or a reason but there can be different scenarios that might be building up that situation. A good scrum master has to identify those patterns and look out for ways to minimize it. Let’s look at a few of the situations that might lead up to lowering the team’s performance:

• Planned Leaves or Holidays – The sprint commitment is directly proportional to the total available capacity of the team. If there are leaves or holidays, the commitment will go less and hence lowering the velocity.
• Legacy product – In case the code has been written long back with no DOCUMENTATION, the new members struggle to figure out things.
• New hire – Onboarding a new associate will impact the sprint commitments as the member is new and needs time to be brought to speed.
• Resignation – If the team members are leaving, it might take some time to fill up the gap.
• Experience – If the team comprises of experienced team members along with new one, then the level of SENIORITY might hinder the team formation.

There can be many reasons, but the scrum master should keep their eyes open for any such patterns and try to help the teams get back to track through coaching and adoption of best practices.