RunningMan:
I'm guessing that you are using ether1 as the WAN, and the item being added as that comes back up is your PPP interface.
16:28:44 interface,info ether1 link up (speed 1G, full duplex)
16:28:45 system,info item added
16:28:45 system,info item added
The odd thing is from the logs is you have multiple ports dropping at the same time (1, 5, 9), across both switch groups. I saw @sbiddle comment in your other (removed) thread - not sure if he has seen the background in this one.
I know, the mods keep removing my post in the router thread, but thats where this belongs now as it is not a BigPipe issue but a router problem, but every time I post there it gets deleted.