The first factor you'll want to inspect if your Dyson vacuum keeps turning on and off is if it has been charged or if the charger itself is working properly. Additionally (and ironically), your home's cleaning devices also require maintenance. Your Dyson vacuum may be pulsing due to a full vacuum bin or filthy filters, both of which can block the constant airflow it needs to operate. That being said, make sure to clean your Dyson vacuum on a regular basis so it can function efficiently and without interruption.