Having trouble connecting to wifi internet on i-pod ! HELP !!!!!?

Before i never had to put in my password at all since the wi-fi was saved to my i-pod at my house and now for the past month it hasnt been able to work like before. I type my CORRECT Password for the wi-fi and it says incorrect password or unable to connect??????? It doesnt even allow for me to forget the network and when i reset it does not work or even go to other network and retype everything it wont work at all !!! PLEASE HELPPP !!!!!!!!