Could you check, what signal/noise values are indicated in Network -> Wireless section, example below.
How far is the access point from the RUT?
Are there any objects, which could be blocking the signal between devices?
Could it be that you are in an environment congested by other access points? Try using different WiFi channels, also, change channel width to 40MHz, see if that helps.
From the logs there seems to be issues creating iptables and routes due to network name being too long:
create_iface_iptables: iptables-restore v1.8.7 (legacy): chain name `mwan3_iface_in_LakewoodCampground' too long (must be under 29 chars).
Try to shorten it.