Could not set interface wlan0_1 flags (UP): Resource busy.

[BGFWDev]

Unfortunately, I can't get hostapd to stay up with my config. It gets stuck in "Could not set interface wlan0_1 flags (UP): Resource busy."

Here is the set up.

root@OpenWrt:~# /opt/com.test_box/bin/ap-diag wifi -v
device: wlan0 is VALID
Location: PCI slot 1 (0000:01:00.0)
Permanent MAC Address: f8:62:aa:60:14:gf
Supported modes: a/g/n/ac
Supported interfaces: 8
VLAN support: true
2.4GHz Band:
20MHz: 1,2,3,4,5,6,7,8,9,10,11
5GHz Band:
20MHz: 36,40,44,48,149,153,157,161,165
40MHz: 36,40,44,48,149,153,157,161

device: wlan1 is VALID
Location: PCI slot 2 (0000:02:00.0)
Permanent MAC Address: f8:62:aa:60:15:gf
Supported modes: a/g/n/ac
Supported interfaces: 8
VLAN support: true
2.4GHz Band:
20MHz: 1,2,3,4,5,6,7,8,9,10,11
5GHz Band:
20MHz: 36,40,44,48,149,153,157,161,165
40MHz: 36,40,44,48,149,153,157,161

Is this a Network Manager issue?