Hmm, this does not normally happen. To help us understand the problem, can you provide some more details?
1. You only configured the Wifi parameters and Internet, no other configuration was changed from default. Right?
2. What’s your Internet speed by the ISP?
3. How often does this happen? Does it happen periodically or at random times?
4. When you lose Internet connection, is it Wifi only or is wired connections to the router also dropped?
5. What’s the error if you try to load a web site in the browser?