Voice of Nigeria in Swahili again on wrong or new frequency on Jan.19

NIGERIA   Voice of Nigeria again on wrong or new frequency on Jan.19:
1500-1600 on 15120 IKO 250 kW / 007 deg to NoAf English, as scheduled
1600-1630 on  9690 IKO 250 kW / 248 deg to ECAf Swahili, instead of 11770
1630-1700 on  9690 IKO 250 kW / 248 deg to WCAf Yoruba, as scheduled