ERL3, PPPoE disconnect problem

I've experienced this twice now: my WAN/PPPoE connection disconnects and ERL3 does not successfully reconnect.

The first time, I just rebooted ERL3 and it started working again.

This time, I did a

disconnect interface pppoe0
connect interface pppoe0

and that got me back online.

I just updated from 1.8.0 to 1.9.0 and unfortunately lost the PPPoE log that I was going to post (it was the output of 'show interfaces pppoe pppoe0 log').  Some of the relevant-looking messages from that log that had in my browser history:

Connection terminated: no multilink

LCP TermReq id=0xe5

sent [LCP ConfReq id=0x2 <mru 1492> <magic 0x41e12a7b>]

There were many hundreds of that last line in the pppoe log, and the next lines were from me manually disconnecting the connection.

Here's part of my config:

ethernet eth1 {
        description Internet
        duplex auto
        firewall {
            in {
            }
            local {
                name WAN_LOCAL
            }
        }
        speed auto
        vif 201 {
            description "CenturyLink VLAN"
            firewall {
                in {
                }
            }
            pppoe 0 {
                default-route auto
                firewall {
                    in {
                        name WAN_IN
                    }
                    local {
                        name WAN_LOCAL
                    }
                    out {
                    }
                }
                mtu 1492
                name-server auto
                password *******
                user-id ******@*******
            }
        }
    }

Does anyone have any insight or suggestions?