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Have had my new S4 for about 3 weeks now and am starting to notice that it continually forgets my wifi network key.
It scans and finds the routers no problem but I have to enter the key manually most times.
This happens irrespective of if I toggle wifi on and off or not.
Have already done a factory reset and no I don't have any D link routers.
Any help very gratefully received.
Thanks
Jon
It connects, but sometimes says it got dropped due to the internet quality not being good enough (which is a load of crap, as I never had probs with 4.2, and the router is in my office/bedroom. It also seems to just drop off without asking me (maybe a new powersave feature?)... which is REALLY annoying, as I get up in the morning and have to manually connect it to see my email/FB notifications 
I've been having problems with the wi-fi since upgrading to 4.3..................... Has anyone else found a solution?
Thanks!


I have a droid razr and when I go into settings to turn on my wifi, after five seconds, it toggles back to off. I rebooted the phone, deleted all downloaded apps, and then finally I did a factory reset. Nothing is working. Is there anything else I should try???![]()
Factory reset does NOT solve the problem. I've done this countless times.
Since the 4.3 update my phone has been switching back and forth between mobile data and Wi-Fi without me doing it. When it does switch it tells me that the network connection is too slow.
1. Go to your (stock) phone dialer
2. Dial *#0011#
3. Select "WiFi"
4. Turn off "Wifi Power Save Mode".
5. Exit this menu, turn off your Wifi and turn it back on. If you already entered all your wifi credentials, forget your network info (remove it) and re-enter it again.
Hi folks, I believe I found the solution to this particular problem.
Under WiFi settings, press the Menu key and go to Advanced. Then, disable "Auto network switch."
I was having the EXACT same problem as above, and had tried many things short of a factory reset, until I came upon this setting. After disabling that, my WiFi has been solid for about a week now.
Basically I think what is happening is Android is disabling WiFi when it thinks it can get better speeds via mobile/cellular data. This makes a certain amount of sense if you think about it, but, it may not be what many of us want.
(Btw, after changing this myself and seeing the results, I did some more specific searches online and did find some others had done this as well, and also disabled "Always allow scanning." I had disabled mine prior to figuring out this issue so I don't know what would happen if you had that setting still on, but Auto Network Switch disabled. So it's possible you have to disable both.)
One caveat: the phone now annoyingly prompts me for whether or not I want to join another WiFi network once I go beyond the range of my own router. I haven't found a way to stop this yet, but, this situation is still far preferable to the constant on/off problem, so I can live with it if there's no way to stop it.
.I had wifi issues. The phone constantly notified that my connection was weak (not) and then would drop the wifi only to re-connect and notify, drop, re-connect...
I had done all the phone settings others suggested. Did not work. So my router seemed like the next logical step.
1) Went to my router settings
2) Clicked on the WIRELESS settings
3) Found the Security Options: WPA2-PSK [AES] was checked
4) Checked WPA-PSK [TKIP] instead
Restarted the wifi on my phone and have not had one notification or dropped wifi since.
I have a NETGEAR R6300 router.
Hope this helps.
My problem is getting WiFi to function at the multiple facilities (about 18) that I work out of. As I've pointed out, my home router is not the problem. I wish Samsung or one of us were able to solve my WiFi dysfunction which renders it useless.
Given that AT&T makes money if your WiFI is broken and your phone moves you to network data and you go over...lately I haven't felt AT&T was trustworthy.