My RE220 no longer connects to my wifi.  This seems to have started in late December when videos stopped recording on the security cameras that use the extenders.  I have made no changes to my configuration, equipment, router, etc.  I have tried to connect via the tp-link website and the tether app.  I can select the primary and extender routers on the tether app but the Range Extender never changes beyond the green power light.  Any suggestions?  TIA

PS. I am assuming it is the extenders causing the cameras to stop working since the extenders no longer show active wifi.