Bugs are often times like ants: They don't come alone and are often representative of many more of their own kind. After you fix any bug, retrospect on why it occurred to begin with and what the team could have done to prevent it. If the bug was very serious (e.g. a production outage), bring the team together with a formal post-mortem report and meeting.
This video is a clip from our debugging masterclass. You can watch it here: [Masterclass] How To Become A Debugging Master And Fix Issues Faster