On many occasions, humanity started to develop more advanced technology, either on their own on based on that of the Anu. Humans are curious, they explore, they put things together.
As another cycle of the energies came by and the Anu got more crazy, they spent more and more time and stasis, and they grew increasingly weaker. Because of the ongoing war between them, their numbers grew smaller.
Concerned that humanity’s technological development would be used against them, especially at times when they were in stasis, the Anu beganto bomb human civilisations back to the bronze age and keep them there for a very long time.