AVU Satellite Frequency Changing Problem

Recently there was an instruction circulated to all AVU partnership institutions to change their receiver frequency to a new value due to a change in transponder servicing the AVU. This I did. But for some reasons that I cant figure out, the figure keeps reverting to its old value anytime there is power outage. This i was able to confirm also happened in UniJos. In view of this I am soliciting for whoevre has encountered and solved this problem to please provide us with the solution.

Auwal Tata
BUK