It seems that when the connection bandwidth is maxed out for just a few minutes, the LCP Echo is not being sent/received properly and it causes the PPPoE connection to the ISP to drop (from my router's end).
I haven't noticed this until now since I don't download large files often, but yesterday I was downloading the iOS 13.4 update, which utilized the 100Mbit connection for more than 5 minutes and the PPPoE kept dropping.
The issue seems to be present in both 2020.1 and 2020.2.084-beta...
FreshTomato 2020.1 and LCP Echo Intervals for PPPoE connection
I haven't noticed this until now since I don't download large files often, but yesterday I was downloading the iOS 13.4 update, which utilized the 100Mbit connection for more than 5 minutes and the PPPoE kept dropping.
The issue seems to be present in both 2020.1 and 2020.2.084-beta...
FreshTomato 2020.1 and LCP Echo Intervals for PPPoE connection