Samsung Galaxy S4 WiFi issues are plaguing users with D-Link routers unable to connect with the flagship Samsung smartphone.
Galaxy S4 WiFi issues seem to be limited to a few D-Link brand routers and not limited to a particular carrier version of the Galaxy S4.
Samsung confirmed in a statement that they are aware of the problem. ZDNet, but it doesn’t appear that Samsung is working on a fix. stated by Samsung
This is an issue with D-Link routers caused by firmware stored in a particular access point. Customers should update their firmware to the latest version or restart the access point.
Fix Samsung Galaxy S4 WiFi issues with few simple steps. If that fails, users may need to purchase a new router.
While most issues appear to be limited to the D-Link DIR-655 and DIR-855 routers, others may be affected. There are ways to try to solve the problem without leaving home.
How to Fix Galaxy S4 WiFi Issues
Users who cannot connect to WiFi on their Samsung Galaxy S4 or connect and lose their connection quickly can take some steps to fix Galaxy S4 WiFi problems. Many of these fixes are possible without spending any money, but if that fails, users may need to invest in a new router.
Restart the router
The easiest solution to Galaxy S4 WiFi problems is to reboot the router. This is not a guaranteed fix, but it is the simplest step, so we recommend doing this first.
Go to where your router is, find the power cord and unplug it for at least 30 seconds. After waiting for a short while, plug it back in and see if the issue is resolved.
If not, the next fix will update the router which is more likely to fix the problem.
Update Router
The next step in fixing Samsung Galaxy S4 WiFi problems is to update the router firmware. This process is simple, but you will need to know your router password and username. This is the administrator password, not the password you use to connect to a device.

Update D-Link DIR-655 router firmware to fix some Galaxy S4 WiFi issues.
Here Instructions for upgrading D-Link DIR-655 firmwareGalaxy S4 is one of the common routers with WiFi issues.
Allow 15 to 30 minutes for this process, but it can go faster. Other users will lose connection for a short while while the router loads the new firmware and reboots, so be warned other users.
Get a New Router
Some users are reporting that Galaxy S4 WiFi issues still exist despite trying multiple updated router software. It’s a good idea to invest in a good new router if the previous steps don’t work. It seems unlikely that Samsung will prepare a fix for this issue and it may take some time for D-Link or Samsung updates to arrive.
Users can get a new router for $50 to $150, depending on the features required. While this is no mobile change, it will help users exceed mobile data limits.
We recommend Belkin, Netgear and ASUS routers for speed and reliability, but we recommend doing some research before choosing a new router.