The best first step when faced with an application crashing intermittently without error messages is to check for updates to the application. Updates often contain bug fixes and improvements that can resolve crashing issues. Uninstalling the application without checking for updates might not resolve the underlying issue if it is related to a known bug that is already fixed in a newer version. Clearing temporary files is a good maintenance step, but it might not address application-specific crashes. Running a full virus scan is essential when there is a suspicion of malware, but without any indications of malware, it may not be the most efficient first step for this specific issue.