Well, not quite enough information to perhaps help you with an answer. A few questions:
What device / computer are you using to connect to the wifi network?
What system is the device / computer running? MacOs, iOS, Android, Windows, or Linux?
Anyway, someone might be able to help you if you can furnish us with a few more details. As a stab, given no real information, it would appear that your wifi networking interface is defective, or perhaps you are having issues with a network device driver or some such. Sorry, that's all I can suggest at this point. Did you do something significant to your device / computer a week ago that may have contributed to this problem? Happy Holidays.