H4 visa status - discussion

USA H4 Visa
1

H4 visa status changed from “Administrative processing” to “Application received” again, What does that mean ?

2
3

Thanks for the reply, Here is my case history
May 20th - Documents submitted
May25th - Status changed to "Application Received
June 6th - Status Changed to “Administrative Processing”
June 8th - Status Changed to “Application Received”

Did not receive any email or phone call on any missing docs so far, what other reasons would cause status changing back to Application received in general ?