Log Level, Crash Debug Steps

[Chris1]

Hello,

my system crashes randomly, after 5 minutes or up to 4 days. The issue is that I see nothing. How can I increase logging or has someone another idea how to get closer to solve the issue ?
I was running the same hardware twice with an older OPNsense versions and it was running flawless (15.x it was, I guess). It would be great to get some hints how to proceed.
Thanks a lot already,
        Chris

This is the hardware and OPNsense version I am using.

OPNsense 19.1.1-amd64
FreeBSD 11.2-RELEASE-p8-HBSD
OpenSSL 1.0.2q 20 Nov 2018

Hardware
Supermicro X10SBA Board
    Intel® Celeron™ J1900 (on board)
    1 PCI-E x2, 1 Mini-PCI-E slot and 1 mSATA slot, 2 SATA 2.0, 4 SATA 3.0 (RAID 0, 1, 10)
    SSD 64 GB M-SATA
    Intel® HD Graphics with HDMI,
    Intel® i210AT dual port GbE LAN
    1 USB 3.0 port and 5 USB 2.0 ports
    8GB 1333MHz DDR3L Non-ECC
    SO-DIMM in 2 socket
    HDMI Display Full HD connected