[Afshin RK]

I've updated my Samsung Galaxy S7's firmware to Android 7 and ever since I can no longer get a stable internet through wifi connection. The problem is that even though I can connect to the wifi router, every few minutes I get disconnected from the internet (not the wifi), getting the message "Internet may not be available". This keeps on happening every few minutes (even seconds) erratically. I tried other devices see if the problem is pertained to my wifi router and all of them got a sound and flawless connection. I have also tried formatting my cache partition, forgetting all the wifi hotspots and reconnecting again, setting static IP and DNS manually and none of them solved the problem. Please help.

[B. Diddy]

Welcome to Android Central! Does this happen with all wi-fi networks, or only your own?

Try wiping the cache partition: https://support.t-mobile.com/docs/DOC-24999

[Afshin RK]

Thanks. It happens with all Wifi networks.

I have already deleted the cache partition.

Here's the screen shot of my device displaying the unavailable network message.

[B. Diddy]

Of all of the wi-fi networks you've tried, are they all secured networks? Does this also happen with open networks?

Does it also happen in Safe Mode? https://support.t-mobile.com/docs/DOC-28008

[Afshin RK]

I did try unsecured networks as well, same problem persists. And nothing changes in safe mode.

[B. Diddy]

You may need to consider reinstalling the firmware using Smart Switch: http://www.sammobile.com/forum/showthread.php?t=29914