Sophos UTM 9.5 Home hangs sometimes at the boot process

Hi,

my Sophos UTM 9.5 Home Edition hangs sometimes at the boot process. It happens at a reboot as well as when the UTM was completly powered off and on again.

It hangs at the splash screen ("Press F2 for details"). When I press F2, I can see the following log:

When the UTM not hangs, it boot up and run without any problem.

What I've already tried to solve the problem:

- Reinstalled Sophos UTM
- Updated firmware of BIOS and SSD
- Checked S.M.A.R.T.-> OK
- Detail check of SSD -> OK

My hardware:
Mainboard: Gigabyte GA-J1900N-D3V
SSD: 60GB Kingston SSD Now V300 (SV300S37A/60G)

I've found a post of a similar problem where the power supply was the reason. But there the issue also occured when the system booted fully up and ran for a while. Not sure if it could be the same issue at my UTM.

Can anybody see more details in the screenshots above to identify the problem?

Thank you.

Jas Man