Something is mysteriously flushing my firewall states

[134]

I've been seeing strange behavior with my OpnSense router. Occasionally, my gaming PC (on VLAN 10) got kicked out of online game server, active SSH session from VLAN 20 to a local server on VLAN 30 is dropped with 'broken pipe' error. These events always occur at same time. It's almost like i go to Firewall > Diagnostics > States Reset on Web GUI and click big Reset button.

Frequency of this problem varies from zero in 10+ hours to several occurrences within hour at evening.

How do I narrow down the cause of this strange issue? Could hardware (bad cables, bad NIC, ....) be the reason that triggered the reset of firewall states?

[marcquark]

Maybe your gateway disconnects and reconnects briefly? There's a setting in the advanced firewall tab, something like "Disable state killing on gateway failure" or so.