Hi, thanks for using JustAnswer.com I am Cris.
When you try to connect what happens? Does it say authentication failed or any message?
Are you sure you have the correct password?
Can you tell me what type of router you have?
OK, please do a restart of your device.
Press and hold the power button for 20 seconds. Then device will shut off then turn it back on and try it again. Let me know the outcome.
They usually last a couple of years however it doesn't seem that is the issue with yours. It could be a network issue between your device and the wireless router.
Is there only 1 WiFI network there?