WAN drops, GATEWAY pending

[error_account]

Hello,

My pfsense randomly drops WAN and gateway goes pending (sometimes after few weeks, sometimes few times per day).
At the beginning the device reboot helped, but now I figured out, if I set WAN's IPv4 Configuration Type to none (save) then back to DHCP, this do the trick but it's very frustrating because I need always log in and I need manually restart openvpn (the outgoing LAN traffic goes over ExpressVPN).

What I tried with gateway:

• set monitor IP to 8.8.8.8
• disable gateway monitor action
• disable gateway monitoring

What I tried with WAN interface:

• speed and duplex set to 1000baseT full-duplex from automatically
• DHCP advanced configuration select freeBSD default

Does anyone have an idea what should I try?

Here are my details:

When goes pending:

The log when error occurs (I marked with yellow when it starts fail):

Gateway settings:

WAN interface settings: