Why does PPPOE terminate every 5 minutes?

Question

network hardware

An ordinary router from ZYXEL that is used at home, there are no loads, the provider on the side says that everything is fine.
I thought it was overheating, but after turning it off and on after an hour, it still resets pppoe
. At the same time, the Internet itself is normal, there are no packet losses and the ping is normal.
upd: Logs do not change in any way. He writes the same. It happens that sometimes other errors slip in the logs, but right there ... As if I myself pull out the cable and insert it ...

Jul 14 22:50:51ndmService: "PPPoE0": unexpectedly stopped.
Jul 14 22:50:51ndmNetwork::Interface::Base: "PPPoE0": interface is up.
Jul 14 22:50:54pppd[759]Plugin rp-pppoe.so loaded.
Jul 14 22:50:57pppd[759]pppd 2.4.4-4 started by root, uid 0
Jul 14 22:50:57pppd[759]Found unterminated session: 292:00:00:1a:19:54:bd
Jul 14 22:50:58pppd[759]Sent PADT
Jul 14 22:51:03pppd[759]PPP session is 130
Jul 14 22:51:03pppd[759]Using interface ppp0
Jul 14 22:51:03pppd[759]Connect: ppp0 <--> ubr_nas0
Jul 14 22:51:06pppd[759]CHAP authentication succeeded
Jul 14 22:51:06pppd[759]peer from calling number 00:00:1A:19:54:BD authorized
Jul 14 22:51:07pppd[759]local  IP address 85.95.156.44
Jul 14 22:51:07pppd[759]remote IP address 172.16.26.8
Jul 14 22:51:07pppd[759]primary   DNS address 85.95.129.7
Jul 14 22:51:07pppd[759]secondary DNS address 85.95.151.7
Jul 14 22:51:07ndmNetwork::Interface::Base: "PPPoE0": interface is up.
Jul 14 22:51:07ndmNetwork::Interface::PPP: interface "PPPoE0" is global, priority 1000.
Jul 14 22:51:07ndmNetwork::Interface::PPP: adding default route via PPPoE0.
Jul 14 22:51:07ndmNetwork::Interface::PPP: adding nameserver 85.95.129.7.
Jul 14 22:51:07ndmDns::Manager: name server 85.95.129.7 added, domain (default).
Jul 14 22:51:07ndmNetwork::Interface::PPP: adding nameserver 85.95.151.7.
Jul 14 22:51:07ndmDns::Manager: name server 85.95.151.7 added, domain (default).
Jul 14 22:51:07ndmNetwork::Interface::IP: "PPPoE0": IP address is 85.95.156.44/32.
Jul 14 22:51:07ndmCore::Session: client disconnected.
Jul 14 22:51:09miniupnpdHTTP listening on port 60034
Jul 14 22:51:09ndmCore::Server: started Session 127.0.0.1:0.
Jul 14 22:51:09miniupnpdlistening for NAT-PMP traffic on port 5351
Jul 14 22:54:06pppd[759]No response to 3 echo-requests
Jul 14 22:54:06pppd[759]Serial link appears to be disconnected.
Jul 14 22:54:06pppd[759]Connect time 3.0 minutes.
Jul 14 22:54:06pppd[759]Sent 2993 bytes, received 5292 bytes.
Jul 14 22:54:07ndmCore::Session: client disconnected.
Jul 14 22:54:09miniupnpdHTTP listening on port 60486
Jul 14 22:54:09ndmCore::Server: started Session 127.0.0.1:0.
Jul 14 22:54:09miniupnpdlistening for NAT-PMP traffic on port 5351
Jul 14 22:54:12pppd[759]Connection terminated.
Jul 14 22:54:12pppd[759]Sent PADT
Jul 14 22:54:13pppd[759]Modem hangup
Jul 14 22:54:13pppd[759]Exit.
Jul 14 22:54:13ndmService: "PPPoE0": unexpectedly stopped.
Jul 14 22:54:13ndmNetwork::Interface::Base: "PPPoE0": interface is up.
Jul 14 22:54:16pppd[777]Plugin rp-pppoe.so loaded.
Jul 14 22:54:16pppd[777]pppd 2.4.4-4 started by root, uid 0
Jul 14 22:54:16pppd[777]Found unterminated session: 292:00:00:1a:19:54:bd
Jul 14 22:54:16pppd[777]Sent PADT
Jul 14 22:54:17pppd[777]PPP session is 121
Jul 14 22:54:17pppd[777]Using interface ppp0
Jul 14 22:54:17pppd[777]Connect: ppp0 <--> ubr_nas0
Jul 14 22:54:17pppd[777]CHAP authentication succeeded
Jul 14 22:54:17pppd[777]peer from calling number 00:00:1A:19:8A:2F authorized
Jul 14 22:54:17pppd[777]local  IP address 85.95.156.69
Jul 14 22:54:17pppd[777]remote IP address 172.16.26.7
Jul 14 22:54:17pppd[777]primary   DNS address 85.95.129.7
Jul 14 22:54:17pppd[777]secondary DNS address 85.95.151.7
Jul 14 22:54:17ndmNetwork::Interface::Base: "PPPoE0": interface is up.
Jul 14 22:54:17ndmNetwork::Interface::PPP: interface "PPPoE0" is global, priority 1000.
Jul 14 22:54:17ndmNetwork::Interface::PPP: adding default route via PPPoE0.
Jul 14 22:54:17ndmNetwork::Interface::PPP: adding nameserver 85.95.129.7.
Jul 14 22:54:17ndmDns::Manager: name server 85.95.129.7 added, domain (default).
Jul 14 22:54:17ndmNetwork::Interface::PPP: adding nameserver 85.95.151.7.
Jul 14 22:54:17ndmDns::Manager: name server 85.95.151.7 added, domain (default).
Jul 14 22:54:17ndmNetwork::Interface::IP: "PPPoE0": IP address is 85.95.156.69/32.
Jul 14 22:54:17ndmCore::Session: client disconnected.
Jul 14 22:54:19miniupnpdHTTP listening on port 38183
Jul 14 22:54:19ndmCore::Server: started Session 127.0.0.1:0.
Jul 14 22:54:19miniupnpdlistening for NAT-PMP traffic on port 5351
Jul 14 22:57:07pppd[777]LCP terminated by peer (Peer not responding)
Jul 14 22:57:07pppd[777]Connect time 2.9 minutes.
Jul 14 22:57:07pppd[777]Sent 11912 bytes, received 13140 bytes.
Jul 14 22:57:07ndmCore::Session: client disconnected.
Jul 14 22:57:09miniupnpdHTTP listening on port 57491
Jul 14 22:57:09ndmCore::Server: started Session 127.0.0.1:0.
Jul 14 22:57:09miniupnpdlistening for NAT-PMP traffic on port 5351
Jul 14 22:57:10pppd[777]Connection terminated.
Jul 14 22:57:10pppd[777]Sent PADT
Jul 14 22:57:10pppd[777]Modem hangup
Jul 14 22:57:10pppd[777]Exit.