Selenium is prone to "racing" its browser, which can lead to tests failing due to the browser's faster execution speed. This happens because Selenium interacts with a page at the speed of code, before it's fully loaded by the user. To fix this, Selenium should repeat its actions and assertions until they work. The issue arises from websites being designed for users' slower speeds, and web pages using JavaScript to load content after initial appearance. Selenium can't wait for these additional loads, leading to tests failing. To solve this, developers use spin asserts, which retry a test function over and over until it works, effectively making Selenium "lose the race" by waiting for the correct page loading conditions.