Welcome to Android Forums. Sorry for the delay in responding to your question.
A little more info would be better, but, I will try to do the best I can to help with the info supplied.
I think your problem is with the router (happens sometimes when you change networks while away from house).
Turn router off and unplug.
On phone,delete/forget your network from this router. Turn off phone.
Wait 5 minutes.
Turn router on and wait for it to fully reboot.
Turn on phone and after it fully reboots sign into your network.
For more info and support go to your phone specific forum here at Android Forums.
Hope this has helped.
AndyOpie150