Nov Update Keeps Removing Custom DNS Setting?!

[Recon0xe]

Updated to latest November 2025 BYK3 and it removed my custom DNS settings and was set to Automatic.

Reinstated Custom DNS, the next day I am seeing ADs all over the place again, checks DNS setting and it's switched back to Automatic and my Custom DNS removed again.

Anyone else with this issue?

S25U

[LORΣL]

In "More connection settings" at the very bottom (below "Private DNS") you'll find "Auto update system configurations" enabled by default. Perhaps if you disable this, your setting will remain. If not, then maybe changing the setting of "Settings > Apps > Device Services > Change system settings" instead (which is allowed by default), or changing them both. I haven't tested it yet

[Recon0xe]

So disabling auto update system config was the first thing I did, made no difference and switched back a few days later. I actually haven't tried to route out the issue further than that, might be something in developer options but I doubt it. It's a weird and annoying issue.

[Elliottsix]

Still haven't heard back from Samsung for this bug for a resolution. Has anyone else?

[DragonWolf5589]

Doesn't make difference.

[DragonWolf5589]

All I got was "thanks for reporting your issue we will pass this on to the relevant team and update when we find a solution" (but every feedback I give says same and never ever have a update for years lol)