Solution to Signal Dropping Suddenly Wireless Connection Issue of iPhone 5 or 5S
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Go to Settings then WiFi and Tap on the arrow nearby the troubled WiFi network then Tap "Renew Lease" to check if the Wireless Connection Issue is fixed.
If it still does not fix, you can tap on "Forget this Network" instead of "Renew Lease" to fix the issue, but using this setting, requires you to reconfigure the WiFi network on your iPhone 5 or 5S by setting the WiFi password.
If you are still facing the Wireless Connection Issue of signal dropping suddenly, you can try to reset the iPhone 5 or 5S's network by going to Settings then General then Reset then Reset Network Settings.