Lumia 950XL 5ghz Wifi issue

I noticed the following behavior with my Lumia 950 10586.164 Build. As soon as the DFS (Dynamic Frequency Selection) of my Fritzbox Router starts, the 5Ghz is stopped for a few minutes as expected on certain 5GHz Channels. During this timeframe the Lumia doesn't switch to the 2.4GHz Band. I have to reboot the Lumia and then the Lumia picks up the 2.4 Ghz Band. Disabling/Enabling the Lumia after a few minutes (when DFS is over) the Lumia switches to 5GHz again. This behavior can may be change depending on the Country Domain ETSI(Europe) or

U-NII (US).

Can somebody confirm it ?

Mauro

I think Scott meant: “There is no special/new firmware update (just) for Windows Insiders. Firmware updates are not part of the pre-release rings (Source).” Consequently, you three are all correct.

Ok, no problem :)

Toggling flight-mode NOT reactivated Wi-Fi in 5 GHz for me. I need to restart my Lumia 950 XL Dual SIM. The loss of signal is very rapid (some minutes to some hours), this solution is not acceptable for me. Also, I confirm that my router is configured to use channel 1 only so it's seems ok with your details about how to operate Windows 10 Mobile.

Considering having no problem if I'm using a WiFi in 2,4GHz, it's clairly looks like a problem with drivers/firmware or with Windows 10 Mobile. But on PC, I have no problem with a WiFi in 5GHz so it's maybe more a specific drivers/firmware bug for Lumia 950 and 950 XL. Maybe only with Dual SIM models.

If this is a problem specific to Mobile, shame Microsoft did not implement a toggle for disable the 5GHz band (on a mobile, speed of the 5GHz band is appreciable but not necessary all the time as on a PC). 

I'll do some tests with Field Medic.

I think Scott meant: “There is no special/new firmware update (just) for Windows Insiders. Firmware updates are not part of the pre-release rings (Source).” Consequently, you three are all correct.

Anyway, in this thread toggling flight-mode reactivated Wi-Fi in 5 GHz. That is because Windows 10 Mobile restricts the usable Wi-Fi channels depending on the country of your SIM. If the connection to the SIM is lost unintentionally, Windows 10 Mobile falls back to 2.4 GHz only, channels 1 to 11. Therefore, if the flight-mode helps in your situation, you are actually facing a different cause: The SIM gets lost internally. In that case, the app Field Medic should help to determine why this happens. However, I do not know how to use/read that app. Anyone?

Anyway, in this thread toggling flight-mode did not help and the whole phone had to be restarted. What is your situation?

No firmware is out for windows insiders. Working great for 8 hours

Disagree: new firmware is out for Insiders as well. Use Windows Insider application for switch to 'Production' ring. After check for update and install the new firmware. After that, use Windows Insider application for reuse your prefered ring ;)

I use this workaround for getting the new firmware yesterday. Early in March, Microsoft synchronize publishing of firmware updates for all Insiders ring without switch to the 'Production' ring - and at same time.

Note: firmware not available in all markets, but in most markets. Jason released the list in its announcement here.

--

I also confirm this issue appear resolve with last firmware released yesterday!

I have a Lumia 950 XL Dual Sim and no issue since upgrade.

Previously, I need to disable 5GHz band in my router to avoid losing WiFi signal.

Nice! :)

--

Edit: bad news, the problem is still there! It seems that stability is better but the problem is not fully resolved. See you at the next update, hoping that this is the right this time!

No firmware is out for windows insiders. Working great for 8 hours