QNAP TS-451D2 keeps rebooting

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1

TS-451D2 accessed via windows 11 PC
QTS 5.2.7.3297
Network uses Adapter 1 + 2 (only 1 cable currently connected)
4x 4TB RAID 5
All seagate ST4000NE001-2MA101
Primarily used as a Plex media Server

Hi. System has been rock solid for 3 years, then a couple of weeks ago had an unexpected reboot whilst transferring data over from PC (mounted share).
Once NAS was back up and running I allowed RAID resync to complete, then ran a filesystem check, as requested by system.
Since then then system reboots within every 24-48 hours - never stays up for more than 48 hours.
Sometimes flags a file system clean after restarting, sometimes not.
Sometimes goes immediately into a RAID resync after restarting, sometimes not.

There is nothing i can see in the Qu logs relating to why the reboots are happening - here’s an example of the event log leading up to the latest restart - nothing, just logged that the system has started up:

| 31299,2025-11-10,14:43:37,—,A007,Power,C001,NAS Power Status,18,[Power] The system has started. |
| 31298,2025-11-10,14:43:37,—,A007,Power,C001,NAS Power Status,19,[Power] The system was not shutdown properly last time. |
| 31297,2025-11-10,03:00:59,—,A227,Malware Remover,C001,General,19,[Malware Remover] Scan completed. |
| 31296,2025-11-10,03:00:04,—,A227,Malware Remover,C001,General,1,[Malware Remover] Started scanning.

Disks are showing as healthy, and no hardware errors.

However….

I can see Hardware Errors in dmesg which appear to be related to a hdd, but not being able to understand these kernel logs I don’t know if this is the cause of the reboots.

start of hardware error message section:

[ 13.702049] scsi 2:0:0:0: Serial Number: WJG2CDLR
[ 13.706900] [Hardware Error]: event severity: fatal
[ 13.706901] [Hardware Error]: Error 0, type: fatal
[ 13.706903] [Hardware Error]: section_type: Firmware Error Record Reference
[ 13.711115] sd 2:0:0:0: [sdc] 7814037168 512-byte logical blocks: (4.00 TB/3.64 TiB)
[ 13.716680] [Hardware Error]: Firmware Error Record Type: SOC Firmware Error Record Type1 (Legacy CrashLog Support)
[ 13.721557] sd 2:0:0:0: [sdc] 4096-byte physical blocks
[ 13.726440] [Hardware Error]: Revision: 0
[ 13.726441] [Hardware Error]: Record Identifier: 3000100000000
[ 13.733648] sd 2:0:0:0: [sdc] Write Protect is off
[ 13.741328] [Hardware Error]: 00000000: 00030001 00000001 00000606 00000000 …
[ 13.741330] [Hardware Error]: 00000010: 00000000 00000000 00000000 00000000 …

Would anyone be able to take a look at the dmesg output to confirm whether this could be the cause of the restarts and if it might just need a replacement hdd to fix?

Any suggestions gratefully received.

Cheers.

2

With random reboots I would always suspect the RAM first. Is that the stock RAM or did you swap it yourself ?

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3

Cheers for the response - I have added a second stick of RAM (QNAP supported type) - when I first bought the nas, over 3 years ago.

I’ll run the system with just the stock memory in for a few days to see what happens.

4

If you still encounter the same problem, please open a support ticket and provide us with the detailed logs. Thanks!

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5

If you have an HDMI output on the NAS then you can boot into the BIOS and run a memory test. QNAP has an app note on how to do this. It will take a while but that will for sure let you know if it is your memory or something else.

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6

Thanks for that information - Very useful to know for the future, I’ll have to track down the info.

Since removing the additional 4GB RAM I added, the system has been stable with no reboots, so it does look like this was the cause of the issue.

7

Thanks, you nailed it on the memory suggestion.

System became completely stable once I removed the additional 4GB RAM module.

Have now purchased and installed another 4GB RAM, so monitoring for the next few days.

Cheers - thought I was looking at having to buy a replacement NAS (can’t live without my Plex!!)

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