I'm exhausted. I have issues with WiFi on not one, by TWO S20FE 4G phones (I bought a FE for me and the wife at the same time on pre-order direct from Samsung)
It will connect fine to WiFi and work perfectly until I make a phone call using WiFi calling. After that whenever I turn off my phone and it is sitting idle it disconnects from WiFi. Sometimes it will stay connected for 5-10 minutes or more, sometimes after just 1 minute it disconnects.
And because my mobile signal is weak in my house, I then miss calls. As soon as I wake up my phone it goes through the process of connecting to WiFi and WiFi calling again and will then work ok, while I have it on, if I turn it off again, it will have the issue again. Off, disconnects, on connects, off disconnects...repeat...
Only thing that corrects it is restarting the phone, where it is then fine again, until I make another call and it starts all over again. And as I have poor mobile reception and it is turning WiFi off and on, and restarting, my battery life is terrible to rub it in.
I've scoured the internet for resolutions, to find many people over many years with WiFi disconnection issues. Things I've tried to resolve it:
4-5 different WiFi networks
home network with 2 different routers,
Telstra 4G mobile hotspot, (anywhere)
public hotel WiFi network, (100km from home!)
plus guest network at home
WiFi router settings
2.4GHz or 5GHz networks, same or different SSIDs
restrict channels to 20MHz,
Factory restart multiple times
Reset network settings multiple times
Run in high performance battery mode
Turn off any adaptive power saving, app sleeping etc
WiFi Calling mobile or WiFi network preferred
Bluetooth and WiFi location scanning
Disabling Hotspot 2.0 connection
WiFi network MAC address type
Switch to mobile data setting
Developer settings, WiFi scan throttling, WiFi-Safe mode, enable WiFi verbose logging
Phone in Safe mode
Turning off bluetooth, disconnecting watch etc
With extra logging turned on, I can see signal strengths are usually totally fine, RSSI -60 usually
Sit phone down with streaming TV, 5 hours straight, no issues, battery life good, the issue isn't when I'm using the phone.
Samsung support, phone, email, chat all give the standard, restart your phone and measures above. Eventually took to a Samsung store which is 130km drive for me...
They took it for a few days and said they tested it "by connecting to WiFi and running video for 1 hour, no issues found". I was furious, but they sent it back to me saying it is fine.
Samsung members app, send logs, and screenshots and videos of issue. They say they can't see an issue in the logs, and that it has been sent to the R&D team who haven't found anything yet (two weeks).
Note, I had S6, S8, S9, S9+, S10 previous to these S20FE phones, some of which at same house on same internet and same router, all worked without fault. (unfortunately I traded in the S9 and S10 to buy these so can't just fall back to them).
So it seems my options....
Move house so I don't need WiFi calling, or get a signal booster
Just turn off WiFi calling, and enjoy the bliss of no-one being able to reach me for work.
Try again for Samsung to give refund, and go buy a Pixel or something (I wondered about the FE 5G version which has come down in price to well below what I paid for the 4G, but I've seen other reports of similar WiFi issues so maybe not, plus I'm so frustrated by Samsung's support)
wait for a software update?
Just accept I have to restart my phone every time I make or receive a phone call!
anything else anyone can suggest!?!?!
As I said I tried two routers at home, plus a hotspot, plus a public WiFi. Same issue on all. Also didn't have issues with s9 or S10 on this router.
When I say I turn it off, I just mean screen off to sleep, not turning it off entirely.
Not sure if this will help- been having my own wifi issues with s20 5G (intermittently dropping sometimes less than a minute apart- and no it is not the router).
See if changing metered network settings will help.
This was a solution in another post.
"MAC address type: Randomized MAC (default) -> Phone MAC
Advanced > Metered Network: Detect automatically (default) -> Treat as unmetered"
If I could guess- watching videos (like when it was tested) won't show the issue likely because it successfully buffers video. My issue has been short bursts of wifi disconnect- frequently enough to eat tons of data. Right before I decided to toss it in a lake, the above has worked for me so far and something I have not seen in other post "solutions". Hope that helps- if I had a dime for every answer blaming the router....