VEN401 WAP admin / channel setting

Hello,

I am managing several RF devices at my house and need careful spectrum coordination.  I also noticed that the VEN401 AP would broadcast at noticeably lower power levels when in channels near the edge of 5GHZ spectrum (like 36).  Just enough to impact my wireless receiver service a few times a day.  I previously used credentials ATTadmin:401!VEN to login and change to a channel in mid spectrum which resulted in improved RSSI to to the area where my receiver is located and service was perfect.  Recently the WAP reverted back to channel 36 and I can no longer login with the ATTadmin:401!VEN credentials.  Anyone know if they changed?

Thanks