Unhappy Xiaomi Mi-3 Wifi error

I just got this phone few days ago and everything was great, up to yesterday. When i got home my phone cant seem to connect with my home network anymore. I have no idea what is going on and tried many suggested fixes like forgetting and reconnecting, resetting router, i even did a factory reset for my phone and tried few apps on the play store. Can anyone help me with this? Thanks so much for your time