TerraMaster Forum

Posted: **02 Jan 2026, 00:59**

Hello.

I am experiencing random hard power-offs on my TerraMaster F4-425 Plus.

The shutdowns happen under disk I/O load, for example:

large data transfers
photo processing (Immich)
torrent downloads
backup jobs

Observed behavior

During normal operation the NAS suddenly powers off without any warning:

HDDs stop immediately
cooling fan stops
front panel LEDs remain ON
device automatically powers on again

This looks like a hardware-level power cut, not a clean shutdown or kernel panic.

Logs

Code: Select all
```
dmesg -T
```
— only contains logs after reboot, nothing suspicious
Code: Select all
```
journalctl -b -1 -e
```
— previous session log ends abruptly, no errors before crash
Code: Select all
```
last reboot
```
shows frequent unclean reboots

Code: Select all

root@truenas[~]# last reboot
reboot   system boot  6.12.33-producti Thu Jan  1 11:18   still running
reboot   system boot  6.12.33-producti Thu Jan  1 05:49   still running
reboot   system boot  6.12.33-producti Thu Jan  1 05:20   still running
reboot   system boot  6.12.33-producti Thu Jan  1 04:50   still running
reboot   system boot  6.12.33-producti Thu Jan  1 03:46   still running
reboot   system boot  6.12.33-producti Thu Jan  1 03:18   still running
reboot   system boot  6.12.33-producti Thu Jan  1 02:51   still running
reboot   system boot  6.12.33-producti Thu Jan  1 02:46   still running
reboot   system boot  6.12.33-producti Thu Jan  1 02:20   still running
reboot   system boot  6.12.33-producti Thu Jan  1 02:15   still running
reboot   system boot  6.12.33-producti Thu Jan  1 01:48   still running
reboot   system boot  6.12.33-producti Wed Dec 31 21:41   still running
reboot   system boot  6.12.33-producti Wed Dec 31 06:01   still running
reboot   system boot  6.12.33-producti Wed Dec 31 04:41   still running
reboot   system boot  6.12.33-producti Wed Dec 31 04:35   still running
reboot   system boot  6.12.33-producti Wed Dec 31 04:30   still running
reboot   system boot  6.12.33-producti Wed Dec 31 04:27   still running
reboot   system boot  6.12.33-producti Wed Dec 31 01:40   still running
reboot   system boot  6.12.33-producti Mon Dec 29 19:39 - 01:39 (1+06:00)
reboot   system boot  6.12.33-producti Mon Dec 29 04:26 - 01:39 (1+21:13)
reboot   system boot  6.12.33-producti Mon Dec 29 03:48 - 01:39 (1+21:51)
reboot   system boot  6.12.33-producti Mon Dec 29 03:41 - 01:39 (1+21:58)
reboot   system boot  6.12.33-producti Mon Dec 29 02:50 - 01:39 (1+22:49)
reboot   system boot  6.12.33-producti Sun Dec 28 23:16 - 00:22  (01:05)
reboot   system boot  6.12.33-producti Sun Dec 28 22:48 - 23:11  (00:22)
reboot   system boot  6.12.33-producti Sun Dec 28 22:20 - 23:11  (00:51)
reboot   system boot  6.12.33-producti Sun Dec 28 21:28 - 23:11  (01:42)
reboot   system boot  6.12.33-producti Sun Dec 28 20:57 - 21:27  (00:29)

Hardware / configuration

Model: TerraMaster F4-425 Plus
CPU: Intel N150
RAM: stock configuration
System drive: separate SSD (not part of data pool)
- previously: Samsung 980 Pro (PCIe 4.0)
- replaced with: new PCIe 3.0 SSD to reduce temperature
Data drives: separate HDDs (Toshiba 4 TB (MG03ACA400) and Toshiba 6 TB (MG04ACA600E))
Temperatures:
- CPU: max ~70°C
- HDDs: max ~50°C

Memory usage does not correlate with crashes.

Operating systems tested

Originally running TOS 6
To rule out OS issues, the system was fully reinstalled with TrueNAS SCALE
The problem is identical on both operating systems

This strongly suggests the issue is not OS-related.

Assumptions

Based on the symptoms, possible causes may be:

BIOS / firmware issue
power delivery (PSU / VRM)
hardware instability under I/O load
CPU power management (C-states)

Questions

Are similar issues known for the F4-425 Plus?
Are there BIOS or firmware updates planned?
What additional logs or tests can I provide to help with diagnosis?

Thank you.

Posted: **02 Jan 2026, 14:58**

Please first check the hard disk and CPU. Additionally, please generate and download the log report in TOS > Technical Support > Issue Report, then send it to our technical support email ([email protected]). We will analyze it. Also, include the link to this post in the body of the email.

TerraMaster Forum

[Help] TerraMaster F4-425 Plus – random hard power-off under disk load (TOS 6 / TrueNAS SCALE)

[Help] TerraMaster F4-425 Plus – random hard power-off under disk load (TOS 6 / TrueNAS SCALE)

Re: [Help] TerraMaster F4-425 Plus – random hard power-off under disk load (TOS 6 / TrueNAS SCALE)