Internet does not connect despite WiFi

I was making an Android app that sends data using Bluetooth. My internet was working fine until I started using my app on the phone. I noticed that the WiFi would randomly disconnect (the WiFi icon in the status bar disappeared). Weird. Now, the phone refuses to connect to the internet.

Here is what I did so far:

1. Switch off the WiFi and turn it back on.


2. Restart my phone.


3. Power off, wait, power on my phone.


4. "Forget Network" and then connect to my home network, again. Ironically, my phone authenticates with the home router but refuses to connect to the internet. It even refuses to connect to 192.168.0.1 which is the IP of the home router with which it just authenticated.

Chrome says that 192.168.0.1 is an unreachable address but the phone is assigned 192.168.0.101 as the address which means they are on the same network.

Can someone please tell me what is going on?

Stock ROM, Galaxy S3 International Edition GT i9300.