There are many reasons could cause your automation test unstable, for example, infrastructure issue, product stability and so on. It is easy to be ignored when the number of your automation tests is small, and it is hard to be fixed when the number of your automation tests is large. I will introduce the majority of reasons why automation tests are hard to maintain, and we always encounter the flaky tests and provide some holistic strategy on how to solve the root cause and bring your automation tests to be efficient and reliable.