Wi-Fi on the Galaxy S26+ supports the newest standards, which means most trouble is the router's side or a power setting. Owners of recent Samsung updates have seen the Wi-Fi switch itself off, so check Wi-Fi Advanced settings under Settings, Connections, Wi-Fi: turn off Turn on Wi-Fi automatically if it is confusing, and turn off Wi-Fi Power Saving Mode. A router that is several years old may mishandle Wi-Fi 7 devices, so update its firmware or try the 5 GHz band by name.
The checks in more detail
Forget the network and rejoin it, restart the router and test the phone on a hotspot to see whether the router is at fault. Check Switch to mobile data, which leaves weak Wi-Fi. If the problem began after the update, clear the cache partition and install the newest patch, and as a last step reset network settings, which clears saved networks.
Owners also report that mesh systems with band steering cause the phone to hang on one band. You can see how the phone is connected in the Wi-Fi network details: the link speed, the band and the standard it negotiated. If the phone negotiated an old standard on a new router, a firmware update for the router or a change from a mixed mode to an all-new mode, if the router offers it, fixes slow connections. Check these before changing any phone setting. Samsung's Auto Hotspot and Wi-Fi sharing features can also grab the radio, so if the S26+ shows a hotspot icon when you did not start one, switch off Mobile Hotspot and Tethering and check that no paired device is using the phone as a router.
Differential
Likely causes of “Samsung Galaxy S26+ will not connect to Wi-Fi or keeps disconnecting”, and how to tell them apart
- 1
Wi-Fi Power Saving Mode
What separates it Wi-Fi drops when the screen is off
How to confirm Turn it off in Wi-Fi Advanced
- 2
An old router with Wi-Fi 7 devices
What separates it Drops and slow speeds
How to confirm Update the router firmware or use 5 GHz
- 3
Switch to mobile data
What separates it The phone leaves weak Wi-Fi
How to confirm Turn it off
- 4
Band steering on a mesh
What separates it The phone hangs on a poor band
How to confirm Give the bands separate names
- 5
A software state after an update
What separates it Wi-Fi turns itself off
How to confirm Clear the cache partition and update
Before you touch a setting
Record this first — changing settings destroys the evidence
- The router and its firmware age
- The band the phone joins
- Whether Wi-Fi turns off by itself
- The One UI version
Try in this order
0 of 9 completedOpen Wi-Fi Advanced
ReversibleSettings, Connections, Wi-Fi, three-dot menu, Advanced settings.
Turn off power saving
ReversibleSwitch off Wi-Fi Power Saving Mode.
Forget and rejoin
ReversibleWith the password ready.
Use 5 GHz
ReversibleJoin the 5 GHz band by name.
Test on a hotspot
ReversibleTo isolate the router.
Reset network settings
ReversibleAs a last step.
Read the connection details
ReversibleTap the connected network in Wi-Fi settings and note the link speed, band and standard.
Update the router's firmware
ReversibleCheck the router's app or page for an update.
Try a different channel width
ReversibleOn the router, set 5 GHz to 80 MHz and 2.4 GHz to 20 MHz for a day.
Model-specific
What is true of this model and not of its siblings
- New standards
- Wi-Fi 7 devices can expose old router bugs.
- Band steering
- Separate band names avoid hanging.
- Negotiated standard
- The details screen shows which Wi-Fi generation is in use.
- Channel width
- A narrower width is steadier in crowded areas.
Stop boundary
When this stops being a self-service repair
- !If Wi-Fi fails on every network after a reset, contact Samsung
- !If only one router fails, contact its maker
- !Report the One UI version
Evidence ledger
Sources behind this answer
Exact questions
Common questions
Why does my S26+ Wi-Fi turn off?+
A power saving setting or an update state.
Does the S26+ support Wi-Fi 7?+
Yes.
Should I update my router?+
Yes, for new standards.
Will a reset delete data?+
No.
How do I see my S26+ Wi-Fi speed?+
Tap the connected network.
Does Wi-Fi 7 need a new router?+
For the full benefit, yes.