Mavis wrote Firmware of your WA854RE is up to date? How many signal lights when it works OK and it stops. What's the channel on your main router? Did you try to change it and reconfigure the range...

Model : Hardware Version : Not Clear Firmware Version : ISP : Hello, A brief summary of the subject at hand follows: 1. From yesterday, from the moment I set up the range extender, to today, around...