Unable to Establish Wi-Fi Connection on LG Nexus 5

Hi. I am using my LG Nexus 5 for few months now. It runs with Android 4.4 Kitkat and a great camera feature. Considering the fact that this is one of the latest phone from LG, I am quite disappointed since I am having issues on establishing my Wi-Fi connection. The connection will usually drops even if I am away for short distance from the router. How can I be able to resolve this? Regards.
