pfSense

I'm sorry for somewhat vague description, there might be actually a few issues here, described one the forum: https://forum.netgate.com/topic/176908/intermittent-packet-loss-related-to-dhcp-with-multi-wan

What I observe is that one WAN interface has 15 minutes DHCP lease time, pfSense tries to renew it every 7 minutes and quite often fails to do so.
As the result interface goes down, which quite often causes pfSense to break networking in a way that even its GUI is not available for some seconds (networking is dead completely: I can't SSH or ping either during this time).

TL;DR: I open pfSense for less than an hour and charts stop updating at some point due to networking issues to pfSense itself.

This cascade of events likely includes several bugs, I attached extra logs in forum thread mentioned above.
Configured category to DHCP for now.

This happened on 2.6.x, still happens on 2.7.0-DEVELOPMENT (built on Fri Mar 10 06:05:33 UTC 2023).
Happy to do additional testing, if it turns out there are a few issues, this can be used as an umbrella for them.