One reason the Guptas lost power was because they

The Guptas lost power because they had a substantial loss of territory and imperial authority caused by their past feudal system and the invasion of the Huna peoples from Central Asia. However, these factors all played in and their were many reasons why the Guptas lost power. After the collapse of the empire, India was ruled again by many regional powers before and a small line of the empire continued to rule a portion of their ex-empire before being ousted.