Read on to know how to fix Wi-Fi dropping issue on an Android phone. But, do remember that the described methods may not help if yours is an old android phone (because it was a common issue on older phones) or faulty hardware on your device.
Step by step guide to diagnose Wi-Fi dropping issue on Android
- First, check Wi-Fi sleep option is enabled on your phone. Go to settings and then tap the Wi-Fi. Here you will see a list of available networks and a new menu option (3 dots). Tap menu and then select Advanced. Now tap “keep Wi-Fi on during sleep” option and make sure that the keep Wi-Fi on during sleep option is set to “Always”. If it was not, try this setting to see if it solves the problem. 
- Check your device for issue. Try if a friend’s phone can connect to the same router (Wi-Fi network), so that you can determine it is the router or your phone that is causing the problem. 
- Now, tap the connection that causing issue and then select “Forget”, at which point you can input your password and connect again. 
- Also, try renaming your phone and removing any recently installed apps. 
- Finally, it may be from the interference of your neighbours Wi-Fi signal. Unless you separate your Wi-Fi channel from competing networks, you will not properly connect to your network. Read this post [Read Here] to know how to find a less crowded channel for your wireless router and change the channel frequency. One of these methods should work for you.