Getting too much PPPoE disconnects and it doesn't go back online

I'm getting problems with PPPoE connection going down and then I'm forced to reboot because it doesn't come back up on it's own.

I've looked up on the forum and found about option keepalive '5 5' which I've set up, but it didn't work, to be honest, I think it's disconnecting even more than before;

Before setting up keepalive option, I took a look at the logs and found those entries:

Sun Apr 18 13:56:06 2021 daemon.warn pppd[18429]: Timeout waiting for PADO packets
Sun Apr 18 13:56:06 2021 daemon.err pppd[18429]: Unable to complete PPPoE Discovery
Sun Apr 18 13:56:06 2021 daemon.info pppd[18429]: Exit.
Sun Apr 18 13:56:06 2021 daemon.notice netifd: Interface 'wan' is now down
Sun Apr 18 13:56:06 2021 kern.info kernel: [ 1352.874291] br-wan: port 1(eth1) entered disabled state
Sun Apr 18 13:56:06 2021 user.notice vpn-policy-routing [18848]: service waiting for wan gateway...
Sun Apr 18 13:56:06 2021 daemon.debug dnsmasq[9090]: stopped listening on br-wan(#23): fe80::20e:c8ff:fe9e:8c6e%br-wan port 53
Sun Apr 18 13:56:06 2021 kern.info kernel: [ 1352.885012] device eth1 left promiscuous mode
Sun Apr 18 13:56:06 2021 kern.info kernel: [ 1352.889490] br-wan: port 1(eth1) entered disabled state
Sun Apr 18 13:56:06 2021 daemon.notice netifd: Interface 'wan' is disabled
Sun Apr 18 13:56:07 2021 kern.info kernel: [ 1353.286150] ax88179_178a 2-2:1.0 eth1: ax88179 - Link status is: 1
Sun Apr 18 13:56:07 2021 kern.info kernel: [ 1353.293782] br-wan: port 1(eth1) entered blocking state
Sun Apr 18 13:56:07 2021 kern.info kernel: [ 1353.299017] br-wan: port 1(eth1) entered disabled state
Sun Apr 18 13:56:07 2021 kern.info kernel: [ 1353.304378] device eth1 entered promiscuous mode
Sun Apr 18 13:56:07 2021 kern.info kernel: [ 1353.309804] br-wan: port 1(eth1) entered blocking state
Sun Apr 18 13:56:07 2021 kern.info kernel: [ 1353.315035] br-wan: port 1(eth1) entered forwarding state
Sun Apr 18 13:56:07 2021 daemon.notice netifd: Interface 'wan' is enabled
Sun Apr 18 13:56:07 2021 daemon.notice netifd: Interface 'wan' is setting up now
Sun Apr 18 13:56:07 2021 daemon.notice netifd: Network device 'eth1' link is down
Sun Apr 18 13:56:07 2021 daemon.err insmod: module is already loaded - slhc
Sun Apr 18 13:56:07 2021 daemon.err insmod: module is already loaded - ppp_generic
Sun Apr 18 13:56:07 2021 daemon.err insmod: module is already loaded - pppox
Sun Apr 18 13:56:07 2021 daemon.err insmod: module is already loaded - pppoe
Sun Apr 18 13:56:07 2021 daemon.info pppd[19738]: Plugin pppoe.so loaded.
Sun Apr 18 13:56:07 2021 daemon.info pppd[19738]: PPPoE plugin from pppd 2.4.9
Sun Apr 18 13:56:07 2021 daemon.notice pppd[19738]: pppd 2.4.9 started by root, uid 0
Sun Apr 18 13:56:07 2021 kern.info kernel: [ 1353.904347] br-wan: port 1(eth1) entered disabled state

What could be causing those frequent disconnects? I've asked the ISP and they said it didn't even show up as a disconnect in their logs, even if I had rebooted