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Sorry for answering this late. But it really took me a while to figure it out.
It my case it was a problem with a multitude of php /usr/local/etc/rc.newwanipv6 pppoe0 REQUEST spawning over and over without quitting. The problem seems to lie in the flock() call which should prevent starting multiple of these requests, but it hangs indefinitely during its acquisition.
In the past it ate nearly all CPU and memory resources, but did it slowly. With the latest version of Opnsense it consumed all memory leading to a kernel crash every few hours. But this made it easier to spot.
After disabling DHCPv6 as a workaround the system is stable for nearly a week, even in the dashboard - which it hasn't been before.

I'm happy I found this thread as I'm suffering from the exact same problem on my private opnsense router.
The WebGUI is quite unreliable, the dashboard loads widgets only seldomly (oftentimes after a fresh restart) and my uptime shows the exact same weird value of 20611 days. Also other parts of the WebGUI, like for example the DHCP leases overview, often don't show information. A few page reloads later it might. System updates via the WebGUI don't work as well. Via SSH everything is fine.

Just to make things clear, system time seems to be fine.

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root@fw:~ # sysctl kern.boottime
kern.boottime: { sec = 1778614567, usec = 705583 } Tue May 12 21:36:07 2026


top doesn't show high load, but I'm wandering why this machine swaps with 8GB of RAM.

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last pid: 64090;  load averages:  3.05, 10.70, 11.72                                        up 26+00:13:03  21:49:10
1559 processes:1 running, 1558 sleeping
CPU:  3.4% user,  0.0% nice, 14.2% system,  0.0% interrupt, 82.5% idle
Mem: 4147M Active, 47M Inact, 9520M Laundry, 1463M Wired, 56K Buf, 476M Free
ARC: 470M Total, 231M MFU, 109M MRU, 8365K Anon, 5040K Header, 117M Other
     259M Compressed, 933M Uncompressed, 3.60:1 Ratio
Swap: 8192M Total, 3637M Used, 4555M Free, 44% Inuse, 12K In

I'm pretty sure it has to do with my configuration or something going havoc on the network. Any business opnsense installation i came across doesn't show this behaviour. But I ran out of ideas how to identify these problems? Any suggestions what to look for or which logs might be helpful?