Galaxy S24 Ultra random soft reboots after Dec 26 update – happens only on Wi-Fi

[Nmcloud]

Hello Samsung Community,

I’m experiencing an issue with my Galaxy S24 Ultra that started immediately after the December 26 software update.

Issue description

• The phone randomly reboots .

• The issue only occurs when Wi-Fi is enabled.

• When I turn Wi-Fi off and use mobile data only, the phone works normally and does not reboot.

• Reboots appear random (not tied to heavy usage or temperature).

Troubleshooting already done

• Full firmware reflashed using Odin with HOME_CSC

• Battery health, temperature, and voltage appear normal

• Issue still persists after reflashing

Important observation

• Reboots do not occur on mobile data

• Reboots only occur when connected to Wi-Fi

Additional notes

• This issue did not exist before the December 26 update

• Logs show clean restarts (no kernel panic or ANR)

• Wi-Fi networks tested are stable and work fine with other devices

At this point, I’m trying to understand whether this is:

• A known issue with the December 26 update

• A Wi-Fi firmware / power management bug

• Or something that requires hardware service or replacement

Has anyone else with an S24 Ultra experienced similar behavior after the December update, especially related to Wi-Fi causing restarts?

Any guidance from Samsung moderators or users would be appreciated.

Thank you.

[Manny730]

make sure your auto restart is not turned on

[Nmcloud]

Thank you for responding. Yes, I have confirmed that it is turned off. The device reboots randomly sometimes twice within an hour and the issue occurs only when connected to Wi-Fi. When using cellular data, the problem is not observed.

[rumbler7809]

Mine just did it today on the network, not wifi.

[neilth]

Have you tried booting into safe mode to see if there's any difference in behavior when using Wi-Fi?

[DRandomUser]

I've had issues where it'll state that something had stopped working and then shortly after, it'll restart. Just yesterday it occurred 3 times in a row within 15 minutes. I hadn't paid attention if it was only when I was wifi though. It just only started to this after the update. Also, I have a Samsung S24+.

[SamsungModerator1 · Accepted solution]

Hey Nmcloud! Welcome to the community! I love my Galaxy S24 Ultra and would be frustrated if it was rebooting. Let’s get this situated for you as soon as we can.

First I would reboot your Router and Modem to ensure the Wi-Fi itself isn't causing this. If that is not the case, I recommend giving this link a shot: https://www.samsung.com/us/support/troubleshoot/TSG10001548/

If this does not help I recommend letting a service technician have a look. As we would like to gather additional information, and look at this from a case by case basis, please provide the full model code and IMEI number of the device as well as your best contact phone number, name, and email. 

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If your unit is out of warranty and you would like to receive quotes on service/labor from an Authorized Service Center near you, please visit:

http://www.samsung.com/us/support/service/location