The loopback could be initiated at the H2TU-R. You can to the "Event History" screen and it should give a list of the loop up events that have occurred. Under the "Source" column should let you know who his initiating the loopback.
Since there have been no more questions regarding this post, it has been marked as "Assumed Answered". Please feel free to mark any correct or helpful answers that may have assisted you. If you still need assistance, please let us know and we will be more than happy to continue working with you.