Voice of Nigeria in English again on 15120

NIGERIA   Again anomaly in broadcasting of Voice of Nigeria in English:
0915-1002 NF 15120 IKO 250 kW / 007 deg to NoAf, ex 9690 / 248 deg to WCAf
But nothing for morning transmissions:
0500-0700 on 15120 IKO 250 kW / 007 deg to NoAf English no signal
0700-0800 on 15120 IKO 250 kW / 007 deg to NoAf French no signal
0800-0900 on  9690 AJA 250 kW / 248 deg to WCAf Hausa no signal
0900-0915 on 15120 IKO 250 kW / 007 deg to NoAf English no signal