[RT-AC68U] Constant debug spam in system log

Hello. New here. Have been getting constant errors in my system log since upgrading to 3.0.0.4.384_20287 firmware manually and resetting the router and configuring settings. I'm using my router in default router mode and have WPS and both wireless radios disabled (I don't use wireless and have my devices wired directly to the router, via a gigabit switch). I'm seeing the following messages in the log, every 10 seconds:

11dpd[291]: unable to send packet on real device for eth1 : No buffer...

[RT-AC68U] Constant debug spam in system log