It is in the link I posted in my previous post
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Thank you,
It does seem like that option is enabled on my router:
root@PyrosRouter:/usr/share# ethtool --show-eee wan
EEE Settings for wan:
EEE status: enabled - active
Tx LPI: disabled
Supported EEE link modes: 100baseT/Full
1000baseT/Full
Advertised EEE link modes: 100baseT/Full
1000baseT/Full
Link partner advertised EEE link modes: 100baseT/Full
1000baseT/Full
Should I turn it off?
-Pyro
It is certainly worth a try, I have it disabled and since then no flapping wan, maybe your problem is somewhere else e.g. with your ISP or Modem but it does not harm to turn it off
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I just got off the phone with Spectrum Charter and they told me they see zero packet loss for the last 30 days, so if they are telling me the truth, the problem is on my end. 
Also, running in tandem with your wireguard script, is this how my local startup file should look?
# Put your custom commands here that should be executed once
# the system init finished. By default this file does nothing.
ethtool --set-eee wan eee off
/usr/share/wireguard-watchdog.sh &
exit 0
-Pyro
Yes that looks fine, I would first only run for 24 hour with eee off and check for wan disconnections and only then use the script but that is up to you
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I don’t want to jynx it, but after a reboot, the WAN interfaces have been solid for almost an hour and a half, and your script has been switching WireGuard interfaces without any issues. I’m going to knock on some wood and let it work.
-Pyro
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Hmm indeed knock on wood, and for the religious a couple of hail mary's or whatever your faith prescribes 
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