@SmokeDetector does it refer to questions or answers? When they get deleted is not possible to know what was the case, unless you check the URL

[ SmokeDetector | MS ] Few unique characters in answer, no whitespace in answer, potentially bad keyword in answer, repeating characters in answer (266): fwrite em determinada linha PHP by user153016 on pt.stackoverflow.com

[ SmokeDetector | MS ] Blacklisted user (70): variable para agregar hora by CristinaP on es.stackoverflow.com