Thank you for addressing this forum post.
One of the main tasks in the automation process is to ensure stable test execution. In the context of a single test execution (or executing a test partially while debugging) the environment uses less resources. When executing a test list with multiple tests in it there usage of resources is higher and thus the execution process might differ.
This is why we recommend using different timeouts and wait steps to keep the execution at the desired speed and not allowing it to outrun the tested application. Also test lists could be used for execution on multiple different environments which might perform differently. So before proceeding to test lists the tests should be stable enough.
The recommendations are to always use a verification for a state or text content of an element once there is any change in the page content. Another approach would be to include a wait for element step which will wait for an element on page before proceeding with the execution. That steps have a property 'EnsureStateIsCurrent'
which (when checked) will verify if the state of the DOM tree is current.
If your website uses AJAX postbacks, you can set the AjaxTimeout value to something other than 0 (which is the default) on key action steps, such as clicking on a Submt or Next button which causes the UI to update. 0 means to not watch and wait for AJAX postbacks. A non-zero value, e.g. 30000, means wait that amount of time after performing the action for any outstanding AJAX postback communication with the web server to finish.
In certain occasions you might need to increase or decrease the timeout for a single element or adjust that globally for the project. Please find some additional information here
I hope this will be useful for you!