Can't establish stable 5GHz connection on stock rom (T-819) - Galaxy Tab S2 Q&A, Help & Troubleshooting

Until yesterday everything worked smoothly, but now my tab connects to my 5GHz network and gets automatically disconnect right after.
My other device (Xiaomi Redmi Note 4) still works with 5GHz so it should be device specific.
2.4GHz is fine, but I'd prefer using the other frequency.
I tried hard rebooting it and resetting wlan settings, but it changed nothing.
Were there any updates recently? Can I see a history somewhere?

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Wifi Connection

My Nexus 6 stopped connecting to my home network. I've rebooted the phone,turned wifi off and on in settings, cycled the modem and the router. All other phones and computers in the house work fine. My phone connected and worked well until today. Now the router shows connecting, then disappears, connection failed. On occasion it will connect but there's no data coming through. Any ideas?
tryker62 said:
My Nexus 6 stopped connecting to my home network. I've rebooted the phone,turned wifi off and on in settings, cycled the modem and the router. All other phones and computers in the house work fine. My phone connected and worked well until today. Now the router shows connecting, then disappears, connection failed. On occasion it will connect but there's no data coming through. Any ideas?
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Click to collapse
I had the same problem and rebooting router helped.
If not that make your phone to forget wifi network or clean cashe (if you have custom recovery)
I've been having the same problem. The only way I could get my Nexus 6 to connect was to cycle airplane mode on and off. I also discovered that my Nexus 6 would not connect to my 5 ghz network when it was set to auto detect the WiFi frequency. I switched the the 5 ghz channel on my router to channel 36 and it seems to have fixed it.
A factory reset with complete data wipe cured the problem. I hope this doesn't become a regular occurrence.

How to fix wifi problem

My mi 5 connects with the wifi router but after sometimes my phone does not recieve any data . Router is working fine .I connected other phones with the same router ,they are working fine .
So, how can I fix this issue?
What ROM are you using? Have you tried to check the WLAN settings in your phone, maybe there is something there that is set incorrectly. like the usage data or the frequency for the wi-fi.
The last resort would be a factory reset.

wifi disconnects then reconnects

Hi all
Has anyone encountered a problem when connected to wifi it will just disconnect for a few seconds then reconnects? I've reset network settings reset phone and reset router but no luck.
Try one band on your router or separate the 5Ghz and 2.4 Ghz networks by SSID. I have seen this before. Sticking to one band worked, although I shouldn't have to.
I've encountered this, but I know it's my isp......they suck
Think I've sorted it now I downloaded an app that let's me connect for virgin media out in the open and i think it was conflicting with my internet.
Mine keeps playing up. Must admit never had half the problems I've had with this like I did with my oneplus 5
Try forgetting your WiFi network and re-adding it.

No 5GHz wifi networks detected nor able to transmit 5GHz hotspot

First off the oligitory i have this phone, P20 pro currently rooted running EMUI 8, stock rom, stock kernel, magisk
Such a weird problem as the title says I can't detect or connect to any 5GHz wifi. I have tried to force connect via "Add Network" function. I have reviewed some files inside /etc that were suggested in a P20 lite thread, can't remember where they were/name, but the "enable 5GHz = 1". Something that is tied to it also, is that I can no longer transmit the hotspot on the 5GHz band, inside the hotspot advanced settings tab.
Now for the things that changed before i noticed no 5GHz networks.
-Changed the 5GHz hotspot to 2.4GHz to penetrate a wall better.
-Traveled to Honduras, switched networks to claro while in Honduras.
I am thinking it might be a geolocation type restriction as ihave never had this happen anywhere else before. It will also be about a week or so till I get back state side to hook the phone back to T-Mobile to see if that changes things. Might be tied the the GPS somehow, might be a stretch but i don't know.
1slotrk said:
First off the oligitory i have this phone, P20 pro currently rooted running EMUI 8, stock rom, stock kernel, magisk
Such a weird problem as the title says I can't detect or connect to any 5GHz wifi. I have tried to force connect via "Add Network" function. I have reviewed some files inside /etc that were suggested in a P20 lite thread, can't remember where they were/name, but the "enable 5GHz = 1". Something that is tied to it also, is that I can no longer transmit the hotspot on the 5GHz band, inside the hotspot advanced settings tab.
Now for the things that changed before i noticed no 5GHz networks.
-Changed the 5GHz hotspot to 2.4GHz to penetrate a wall better.
-Traveled to Honduras, switched networks to claro while in Honduras.
I am thinking it might be a geolocation type restriction as ihave never had this happen anywhere else before. It will also be about a week or so till I get back state side to hook the phone back to T-Mobile to see if that changes things. Might be tied the the GPS somehow, might be a stretch but i don't know.
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Click to collapse
Can other mobile phones find 5Gwifi?
Yes they can. MANY other devices can find and connect to the WIFI. I have got an update after taking the phone out of airplane mode i was able to switch the hotspot back over to the 5GHz. Still cannot connect or find the 5GHz network
1slotrk said:
Yes they can. MANY other devices can find and connect to the WIFI. I have got an update after taking the phone out of airplane mode i was able to switch the hotspot back over to the 5GHz. Still cannot connect or find the 5GHz network
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Click to collapse
Happen to me few days ago after Pie update. It can't find my hotspot created from my Redmi Note 5 Ai over 5Ghz. But it still can find my office 5Ghz network.
Fixed after rebooting the phone. Now it can see both network
So I want to close this thread out. As soon as I connected back to a stateside 4g carrier, the phone decided to re-enable the 5ghz side of the wifi. All of this happened all on its own. I made sure to check it within a short time off reconnecting stateside. Crazy stuff.

Redmi 9C connected to wifi but no Internet

I just bought this phone and I'm trying to use it in my network. I use Ubiquiti products (16-port switches and a bunch of AP access points). I connected the phone via wifi to my network and it has no problem for a while until it just doesn't have Internet connection. It stays connected with its IP address intact but for some reason it cannot seem to reach the Internet. The workaround is to simply turn off the wifi module and turn it back on. It's randomly happening and the workaround is very annoying.
I have a couple of other mobile devices (iPads, iPhones, Android phones, Windows laptops, etc.) and I never experienced the issue with these. I tried connecting the Redmi 9C to all my wifi networks:
Guest wifi with captive portal
Main wifi with RADIUS authentication
IoT wifi with regular WPA2 personal authentication
I tried resetting the wifi settings of the phone. I tried reinstalling the latest MIUI fw/sw.
and the result is the same, every time. At this point, I can safely consider that there has to be something wrong with the phone. I'm not sure if it's because of the MIUI 12 update because I updated the phone to the latest firmware as soon as I got it out of the box. Is this a known issue with this phone? I have another Xiaomi phone (Mi Mix 3) on the same network without any issues.
Any ideas?
Same thing is happening with my Redmi 9c
I am encountering the same problem with my device.
I have my region in Bangladesh (the country I live in) ,tried changing it a few times. Also upgraded my MI UI version but nothing changed.
Ariq55 said:
I am encountering the same problem with my device.
I have my region in Bangladesh (the country I live in) ,tried changing it a few times. Also upgraded my MI UI version but nothing changed.
Click to expand...
Click to collapse
I don't face this problem in my device which framware you using
Try to update in leatest framware
I always use the updated firrmware but it's too late, I returned and asked for a refund for this phone and replaced it with a Huawei Y6P.
I'm having a similar issue with my redmi 9, wifi works fine but all of a sudden it stops working even though it's connected. Apps dont load, messages dont go through and i have to toggle the off and on wifi. I'm on miui 11, there are no updates available when i try to update but i'm about to ask for a refund. This issue is very annoying

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