The first thing you need to do when you get a bug is to see it happen with your very own eyes. From there, you can execute the steps necessary to identify the root cause and fix the bug. However, a lot of engineers aren't diligent enough when they try to get the repro.
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