What is the most common reason a sump pump fails

https://thewhysumppumpsfaildigest.greyhavendaily.com/posts/understanding-why-sump-pumps-fail-and-how-to-prevent-basement-flooding

The most common reason a sump pump fails is a stuck float switch. Over time, debris, minerals, or simple mechanical wear can cause the float to get jammed, preventing the pump from turning on or off properly. When the float gets stuck in the 'off' position, the pump never activates, leading to water backup and potential flooding. Keeping the sump pit clear of debris and occasionally testing the float's movement can help catch this issue early before you end up with a wet basement.