Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
You need to log in to your local wifi router's admin setup.
And set the channel on your WiFi router to something different than it is set to now.
And/or, set your Epson printer to communicate on the same channel as the router does.
This conflict could have happened, if you recently have either:
A. reset the router, by holding down its RESET button for over 10 seconds to several minutes continuously.
B. added other WiFi equipment to the local network setup
C. reset the printer to factory defaults, or several other similar events to the ones already mentioned.
Let me know if you need any help with further details of this process. Also, I'd be interested to hear how it turns out. Thanks.