PPPoE disconect when downloading

Hi good ppl

I am using OpenWRT (OpenWrt 19.07.7 r11306-c4a6851c72 / LuCI openwrt-19.07 branch git-21.044.30835-34e0d65) for the last year on my fiberoptic line.
The router (Linksys WRT1900ACv2) works OK until I start to download large files. When downloading large files I get PPPoE disconnects

Below are the log lines from my Syslog server

|2021-04-21 10:59:13|Daemon.Debug|1.2.3.4|Apr 21 10:59:13 gateway.csf.local pppd[2041]: rcvd [LCP EchoReq id=0xd magic=0x6a424c3a]|
|---|---|---|---|
|2021-04-21 10:59:13|Daemon.Debug|1.2.3.4|Apr 21 10:59:13 gateway.csf.local pppd[2041]: sent [LCP EchoRep id=0xd magic=0xf37b3074]|
|2021-04-21 10:59:13|Daemon.Notice|1.2.3.4|Apr 21 10:59:13 gateway.csf.local pppd[2041]: Modem hangup|
|2021-04-21 10:59:13|Daemon.Info|1.2.3.4|Apr 21 10:59:13 gateway.csf.local pppd[2041]: Connect time 50947.2 minutes.|
|2021-04-21 10:59:13|Daemon.Info|1.2.3.4|Apr 21 10:59:13 gateway.csf.local pppd[2041]: Sent 2366326943 bytes, received 2992730084 bytes.|
|2021-04-21 10:59:13|Daemon.Notice|1.2.3.4|Apr 21 10:59:13 gateway.csf.local netifd: Network device 'pppoe-wan' link is down|
|2021-04-21 10:59:13|Daemon.Debug|1.2.3.4|Apr 21 10:59:13 gateway.csf.local pppd[2041]: Script /lib/netifd/ppp-down started (pid 29105)|
|2021-04-21 10:59:13|Daemon.Notice|1.2.3.4|Apr 21 10:59:13 gateway.csf.local pppd[2041]: Connection terminated.|
|2021-04-21 10:59:13|Daemon.Notice|1.2.3.4|Apr 21 10:59:13 gateway.csf.local netifd: Interface 'wan' has lost the connection|
|2021-04-21 10:59:13|Daemon.Info|1.2.3.4|Apr 21 10:59:13 gateway.csf.local dnsmasq[4255]: reading /tmp/resolv.conf.auto|
|2021-04-21 10:59:13|Daemon.Info|1.2.3.4|Apr 21 10:59:13 gateway.csf.local dnsmasq[4255]: using local addresses only for domain test|
|2021-04-21 10:59:13|Daemon.Info|1.2.3.4|Apr 21 10:59:13 gateway.csf.local dnsmasq[4255]: using local addresses only for domain onion|
|2021-04-21 10:59:13|Daemon.Info|1.2.3.4|Apr 21 10:59:13 gateway.csf.local dnsmasq[4255]: using local addresses only for domain localhost|
|2021-04-21 10:59:13|Daemon.Info|1.2.3.4|Apr 21 10:59:13 gateway.csf.local dnsmasq[4255]: using local addresses only for domain local|
|2021-04-21 10:59:13|Daemon.Info|1.2.3.4|Apr 21 10:59:13 gateway.csf.local dnsmasq[4255]: using local addresses only for domain invalid|
|2021-04-21 10:59:13|Daemon.Info|1.2.3.4|Apr 21 10:59:13 gateway.csf.local dnsmasq[4255]: using local addresses only for domain bind|
|2021-04-21 10:59:13|Daemon.Info|1.2.3.4|Apr 21 10:59:13 gateway.csf.local dnsmasq[4255]: using local addresses only for domain lan|
|2021-04-21 10:59:13|Daemon.Info|1.2.3.4|Apr 21 10:59:13 gateway.csf.local dnsmasq[4255]: using nameserver 208.67.220.220#53|
|2021-04-21 10:59:13|Daemon.Info|1.2.3.4|Apr 21 10:59:13 gateway.csf.local dnsmasq[4255]: using nameserver 208.67.222.222#53|
|2021-04-21 10:59:13|Daemon.Info|1.2.3.4|Apr 21 10:59:13 gateway.csf.local dnsmasq[4255]: using nameserver 208.67.220.220#53|
|2021-04-21 10:59:13|Daemon.Info|1.2.3.4|Apr 21 10:59:13 gateway.csf.local dnsmasq[4255]: using nameserver 208.67.222.222#53|
|2021-04-21 10:59:13|Daemon.Info|1.2.3.4|Apr 21 10:59:13 gateway.csf.local dnsmasq[4255]: using nameserver 208.67.220.220#53|
|2021-04-21 10:59:13|Daemon.Info|1.2.3.4|Apr 21 10:59:13 gateway.csf.local dnsmasq[4255]: using nameserver 208.67.222.222#53|
|2021-04-21 10:59:13|Daemon.Debug|1.2.3.4|Apr 21 10:59:13 gateway.csf.local pppd[2041]: Send PPPOE Discovery V1T1 PADT session 0x302 length 28|
|2021-04-21 10:59:13|Daemon.Debug|1.2.3.4|Apr 21 10:59:13 gateway.csf.local pppd[2041]:  dst 54:1e:56:a5:6b:c0  src c0:56:27:bb:a0:2f|
|2021-04-21 10:59:13|Daemon.Debug|1.2.3.4|Apr 21 10:59:13 gateway.csf.local pppd[2041]:  [host-uniq  f9 07 00 00] [AC-cookie  6f f3 e2 55 a8 4b 26 63 f2 58 93 2f 75 18 76 6b]|
|2021-04-21 10:59:13|Daemon.Info|1.2.3.4|Apr 21 10:59:13 gateway.csf.local pppd[2041]: Sent PADT|
|2021-04-21 10:59:13|Daemon.Debug|1.2.3.4|Apr 21 10:59:13 gateway.csf.local pppd[2041]: Script /lib/netifd/ppp-down finished (pid 29105), status = 0x1|
|2021-04-21 10:59:13|Daemon.Info|1.2.3.4|Apr 21 10:59:13 gateway.csf.local pppd[2041]: Exit.|
|2021-04-21 10:59:13|Daemon.Notice|1.2.3.4|Apr 21 10:59:13 gateway.csf.local netifd: Interface 'wan' is now down|
|2021-04-21 10:59:13|Kernel.Info|1.2.3.4|Apr 21 10:59:13 gateway.csf.local kernel: [3056784.484815] IPv6: ADDRCONF(NETDEV_UP): eth1.2: link is not ready|
|2021-04-21 10:59:13|Kernel.Info|1.2.3.4|Apr 21 10:59:13 gateway.csf.local kernel: [3056784.544509] mvneta f1070000.ethernet eth1: Link is Down|
|2021-04-21 10:59:13|Daemon.Notice|1.2.3.4|Apr 21 10:59:13 gateway.csf.local netifd: Interface 'wan' is disabled|
|2021-04-21 10:59:13|Kernel.Info|1.2.3.4|Apr 21 10:59:13 gateway.csf.local kernel: [3056784.555901] mvneta f1070000.ethernet eth1: configuring for fixed/rgmii-id link mode|
|2021-04-21 10:59:13|Kernel.Info|1.2.3.4|Apr 21 10:59:13 gateway.csf.local kernel: [3056784.563899] IPv6: ADDRCONF(NETDEV_UP): eth1: link is not ready|
|2021-04-21 10:59:13|Kernel.Info|1.2.3.4|Apr 21 10:59:13 gateway.csf.local kernel: [3056784.570050] mvneta f1070000.ethernet eth1: Link is Up - 1Gbps/Full - flow control off|
|2021-04-21 10:59:13|Daemon.Notice|1.2.3.4|Apr 21 10:59:13 gateway.csf.local netifd: Interface 'wan' is enabled|
|2021-04-21 10:59:13|Daemon.Notice|1.2.3.4|Apr 21 10:59:13 gateway.csf.local netifd: Interface 'wan' is setting up now|
|2021-04-21 10:59:13|Daemon.Error|1.2.3.4|Apr 21 10:59:13 gateway.csf.local insmod: module is already loaded - slhc|
|2021-04-21 10:59:13|Daemon.Error|1.2.3.4|Apr 21 10:59:13 gateway.csf.local insmod: module is already loaded - ppp_generic|
|2021-04-21 10:59:13|Kernel.Info|1.2.3.4|Apr 21 10:59:13 gateway.csf.local kernel: [3056784.581642] IPv6: ADDRCONF(NETDEV_CHANGE): eth1: link becomes ready|
|2021-04-21 10:59:13|Daemon.Error|1.2.3.4|Apr 21 10:59:13 gateway.csf.local insmod: module is already loaded - pppox|
|2021-04-21 10:59:13|Daemon.Error|1.2.3.4|Apr 21 10:59:13 gateway.csf.local insmod: module is already loaded - pppoe|
|2021-04-21 10:59:13|Daemon.Info|1.2.3.4|Apr 21 10:59:13 gateway.csf.local pppd[29177]: Plugin rp-pppoe.so loaded.|
|2021-04-21 10:59:13|Daemon.Info|1.2.3.4|Apr 21 10:59:13 gateway.csf.local pppd[29177]: RP-PPPoE plugin version 3.8p compiled against pppd 2.4.7|
|2021-04-21 10:59:13|Daemon.Notice|1.2.3.4|Apr 21 10:59:13 gateway.csf.local pppd[29177]: pppd 2.4.7 started by root, uid 0|
|2021-04-21 10:59:13|Daemon.Error|1.2.3.4|Apr 21 10:59:13 gateway.csf.local pppd[29177]: Interface eth1.2 has MTU of 1492 -- should be at least 1500.|
|2021-04-21 10:59:13|Daemon.Error|1.2.3.4|Apr 21 10:59:13 gateway.csf.local pppd[29177]: This may cause serious connection problems.|
|2021-04-21 10:59:13|Daemon.Debug|1.2.3.4|Apr 21 10:59:13 gateway.csf.local pppd[29177]: Send PPPOE Discovery V1T1 PADI session 0x0 length 12|
|2021-04-21 10:59:13|Daemon.Debug|1.2.3.4|Apr 21 10:59:13 gateway.csf.local pppd[29177]:  dst ff:ff:ff:ff:ff:ff  src c0:56:27:bb:a0:2f|
|2021-04-21 10:59:13|Daemon.Debug|1.2.3.4|Apr 21 10:59:13 gateway.csf.local pppd[29177]:  [service-name] [host-uniq  f9 71 00 00]|

Thank you

Looks like MTU was the issue

I changed MTU from "recommended by ISP" 1492 to 1500 and no PPPoE disconnects. for the last 4 hours and 20GB of DL

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