N5105 - ESXI 8.0 - I225-V passthrough - OPNSense 22.7.6 - "no carrier"

[just_here]

I bought an Intel Celeron N5105 with 6x Intel I225-V NICs (Topton). I run a VMWare ESXi hypervisor with 1 virtual machine, OPNSense. Versions:

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VMWare ESXI 8.0
OPNsense 22.7.6-amd64
FreeBSD 13.1-RELEASE-p2
OpenSSL 1.1.1q 5 Jul 202

5 of my NICs have been passthroughed to the OPNSense VM. The first (not passthroughed) NIC is in use as ESXI management interface.

I have FttH internet, using a media converter. So my first port (igc2 in this case) is connected to a fibre -> ethernet media converter proven to work. My ISP sends internet through on VLAN 300, so I made the following setup:

vlan01 (tag 300) on igc2 as wan.
bg01 (bridge) on igc0 en igc4 (NICs of physical port 2 and 3)
bg01 set as lan.
ETH1_WAN on igc2, turned on but everything default/off as it's in a vlan.
ETH2_LAN (igc0) + ETH3_LAN (igc4), turned on, but everything default/off as it's in a bridge.

Everything works, everybody happy.
After 20-30 minutes: poof. WAN gone.

OPSense: both igc2 and vlan01 -> "no carrier".

I've tried:
OPNSense restart
ESXI restart
Actual shutdown and startup of the physical machine.

DHCP server and ipv4 adres are only on the LAN interface (bg0), not on igc0 and igc4.
DHCP client is only on vlan01 for ISP / internet.

Any pointers?

[just_here]

Apparently the fibre <-> ethernet media converter provided by my ISP is of low quality and actually crashed. Turning it off and on again brought up the interface. I hope for longer than 30 minutes this time