It has been noticed by some users that their Samsung Galaxy S4 causes WI-FI problems. The connection drops frequently, while in some cases, they are not able to connect it at all. This could boil down to the hardware (the smartphone or router issue) or this could be caused by the software in your Galaxy S4 or the router. Another point of investigation can be the WI-FI settings on your Galaxy S4 or the router.
- Check with another device. Connect it to the router and see if the WI-FI on that device works. If it does, then it is the problem with your Galaxy S4.
- Go to Settings – Connections and tap WI-FI. Tap ‘Menu’ and make sure that ‘Keep WI-FI on during sleep’ is set to ‘Always’.
- Turn off WI-FI power save mode on your device. You can type *#0011# on the phone dialer and then go to Menu > WI-FI and turn WI-FI Power Saver Mode to Of
- Check if the router firmware is updated to the latest version.
- You may have to change the router settings, if the issue is with the router. You may have to make alterations in the 802.11 mode. Check with your ISP to find out how you can troubleshoot the router.