I had the outages again this morning and whilst I got a brief connection up and running I did a clean install of 4.8.3. before the outage I had not done much configuration to the router and eth1 was still set as wan.
I had an idea something is wrong with the network switch itself in the flint 2 because I couldn't see any PPPOE requests actually happening and my TP Link router keeps connecting fine during the outages.
Today this morning even after the clean install of 4.8.3 the internet disconnects were even more frequent, each time I restart the wan interface in luci get user_error or user_request I can't remember which one and nothing else. Anyways when the next outage happened shortly afterwards I thought to myself why not just try the flint 2 with only eth1 cable plugged in?
So I removed each ethernet port cable 1 by 1 and then waited with no success for internet connection until I removed the Lan2 cable which is on the LAN interface since I haven't changed it. This cable connects to a 2.5gbpe switch with an AMD computer which uses a main board that is msi x870e tomahawk that has a Realtek® 8126 5G LAN.
Even as I was typing this post I got an internet disconnect, as soon as I unplugged the cable from my amd pc to the 2.5gbps switch my internet reconnected. I do have other 2.5gbpe devices on this switch like a MSI z790 a pro ddr4 WiFi and another tplink router as access point which have never caused this problem.
It's worth noting that whenever I tested another tplink router for the internet I didn't connect the 2.5gbps switch to the router.
I do have wake on lan turned on my x870-e tomahawk and usually it's on sleep whilst the outages happen. I don't recall exactly if I have the outages whilst using this amd computer.
I built this computer late in September or early October which was just before my big ISP outage in October and then after that many outages happened on all firmwares includinf 4.7.7 which had been stable for months with the 2.5gbps switch.
I will do some investigation into this realtek chip and work outs what going on here.
Thanks
edit: possible similar issue https://forum-en.msi.com/index.php?threads/mag-x870e-tomahawk-wifi-lan-wifi.415147/