# QTS 5.2.8 regression suspected – random reboots/shutdowns with previously stable non-certified RAM (resolved by downgrade to 5.2.7.3297) **URL:** \ **Category:** Compatibility\ **Tags:** firmware\ **Created:** [May 11, 2026, 8:35am UTC](https://community.qnap.com/t/qts-5-2-8-regression-suspected-random-reboots-shutdowns-with-previously-stable-non-certified-ram-resolved-by-downgrade-to-5-2-7-3297/5973 "2026-05-11T08:35:03Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![PickOne](https://avatars.discourse-cdn.com/v4/letter/p/edb3f5/32.png) [@PickOne](https://community.qnap.com/u/PickOne)\ **Post date:** [May 11, 2026, 8:35am UTC](https://community.qnap.com/t/qts-5-2-8-regression-suspected-random-reboots-shutdowns-with-previously-stable-non-certified-ram-resolved-by-downgrade-to-5-2-7-3297/5973/1 "2026-05-11T08:35:03Z")
**Model:** TS-464 **RAM:** 16GB Crucial (2x8GB) **Previous stability:** ~2 years stable operation * * * ### **Issue description** After upgrading to QTS 5.2.8, my NAS started experiencing random restarts and unexpected shutdowns. These issues had never occurred before on this hardware configuration. The system had been running completely stable for approximately 2 years using the same Crucial RAM modules, with no crashes, freezes, or unexpected reboots. * * * ### **Steps taken to isolate the issue** To rule out hardware failure, I performed multiple tests: - Ran **MemTest86** on both RAM modules → **no errors detected** - Verified system logs (no consistent hardware fault indicators) - Downgraded firmware to **QTS 5.2.7.3297** - Tested older version **QTS 5.1.9** as well * * * ### **Result** - On **QTS 5.2.8** → random reboots / shutdowns occurred - On **QTS 5.2.7.3297** → system is fully stable again (currently running for multiple days with 0 issues) - Same exact hardware, same configuration, no other changes * * * ### **Conclusion based on testing** Given the consistent behavior across firmware versions, this strongly suggests a **firmware-level regression or compatibility change introduced in 5.2.8** , rather than a hardware issue. The RAM itself appears healthy based on MemTest86 and long-term prior stability. * * * ### **Support interaction** When contacting QNAP support, the only recommendation provided was to use QNAP-certified memory modules (TS-464-8G(Q23AF055243)), without addressing the firmware behavior difference between versions. While I understand official compatibility guidelines, this does not explain: - Why the system was stable for ~2 years on the same RAM - Why the issue appears only on 5.2.8 - Why the issue disappears completely after downgrading to 5.2.7.3297 * * * ### **Current workaround** Due to stability requirements, I have: - Disabled automatic firmware updates - Remained on QTS 5.2.7.3297 where the system is fully stable * * * ### **Request / Discussion** Has anyone else experienced similar behavior after upgrading to QTS 5.2.8 with non-QNAP certified RAM? Specifically: - Random reboots or shutdowns - Stability restored after downgrade to 5.2.7.x It would be helpful to know if this is an isolated case or a broader compatibility regression. Additionally, if QNAP engineering is aware of any changes in memory handling, training, or compatibility enforcement in 5.2.8, clarification would be appreciated. ---
**Author:** ![manni\_das\_mammut](https://avatars.discourse-cdn.com/v4/letter/m/e9c0ed/32.png) [@manni\_das\_mammut](https://community.qnap.com/u/manni_das_mammut)\ **Post date:** [May 11, 2026, 1:18pm UTC](https://community.qnap.com/t/qts-5-2-8-regression-suspected-random-reboots-shutdowns-with-previously-stable-non-certified-ram-resolved-by-downgrade-to-5-2-7-3297/5973/2 "2026-05-11T13:18:18Z")
E quanto à versão atual, o QTS 5.2.9? ---
**Author:** ![PickOne](https://avatars.discourse-cdn.com/v4/letter/p/edb3f5/32.png) [@PickOne](https://community.qnap.com/u/PickOne)\ **Post date:** [May 11, 2026, 4:14pm UTC](https://community.qnap.com/t/qts-5-2-8-regression-suspected-random-reboots-shutdowns-with-previously-stable-non-certified-ram-resolved-by-downgrade-to-5-2-7-3297/5973/3 "2026-05-11T16:14:48Z")
I am afraid to test it. Did you had issues with 5.2.8 as well and everything is good with 5.2.9 ? ---
**Author:** ![Becker2020](https://avatars.discourse-cdn.com/v4/letter/b/ea5d25/32.png) [@Becker2020](https://community.qnap.com/u/Becker2020)\ **Post date:** [May 11, 2026, 4:34pm UTC](https://community.qnap.com/t/qts-5-2-8-regression-suspected-random-reboots-shutdowns-with-previously-stable-non-certified-ram-resolved-by-downgrade-to-5-2-7-3297/5973/4 "2026-05-11T16:34:19Z")
Hello, my TS-364 with QTS 5.2.9.3451 and Crucial CT16G4SFRA266 16 GB work fine. No problems with QTS 5.2.8.x my TS-264 with QTS 5.2.9.3451 and Crucial CT32G4SFD832A 32 GB work fine. No problems with QTS 5.2.8.x ---
**Author:** ![SteveKo](https://avatars.discourse-cdn.com/v4/letter/s/b3f665/32.png) [@SteveKo](https://community.qnap.com/u/SteveKo)\ **Post date:** [May 12, 2026, 7:52am UTC](https://community.qnap.com/t/qts-5-2-8-regression-suspected-random-reboots-shutdowns-with-previously-stable-non-certified-ram-resolved-by-downgrade-to-5-2-7-3297/5973/5 "2026-05-12T07:52:16Z")
Could you please provide a list of the applications you have installed, along with the apps or use cases you frequently use? We’ll analyze the memory usage of these applications further. Thanks! ---
**Author:** ![PickOne](https://avatars.discourse-cdn.com/v4/letter/p/edb3f5/32.png) [@PickOne](https://community.qnap.com/u/PickOne)\ **Post date:** [May 12, 2026, 9:13am UTC](https://community.qnap.com/t/qts-5-2-8-regression-suspected-random-reboots-shutdowns-with-previously-stable-non-certified-ram-resolved-by-downgrade-to-5-2-7-3297/5973/6 "2026-05-12T09:13:43Z")
These are all my apps, and rclone from QnapRepo, but I don’t use it. I only use the SMB service to backup data from my computer to NAS. And a backup from NAS to USB External, every morning… Meanwhile I have installed 5.2.9 and I got no issues till now, I am still testing it for the next days ![image](https://cdn-community.qnap.com/original/2X/c/caeb91f1b205d115692fe15b7d75d513f04a99cd.jpeg) ![image](https://cdn-community.qnap.com/original/2X/8/81518c671ef205571de61c027ffc3c16e8e6001d.png)