Opnsense web interface unreacheable - listen queue overflow

[devilkin]

I've been having this problem from when I started with Opnsense (20.1 series): after a while the web interface stops responding, and the logs are flooded with

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sonewconn: pcb 0xfffff800840e5ba0 (192.168.20.1:443 (proto 6)): Listen queue overflow: 193 already in queue awaiting acceptance (6 occurrences)
sonewconn: pcb 0xfffff800840e5ba0 (192.168.20.1:443 (proto 6)): Listen queue overflow: 193 already in queue awaiting acceptance (6 occurrences)
sonewconn: pcb 0xfffff800840e5ba0 (192.168.20.1:443 (proto 6)): Listen queue overflow: 193 already in queue awaiting acceptance (6 occurrences)

Restarting the web interface using

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/usr/local/etc/rc.restart_webgui
helps, but I'm curious as to what actually causes this and how to fix it?