@JoeR Me too. Same set up. 4 AP's, every 10 to 11 minutes, large ping attack logged. (Home network, Omada OC200 with ER605 router) Interestingly i don't get any large Ping attacks (well about 2 in 4...

@Vit100 I have a similar issue, with an even simpler setup; Prior to this setup i had NBN FTTN provider == Modem 1 == LAN ... no issues except model overheating and shutting down so replaced modem...