Yesterday afternoon, the internet went down. All devices refused to connect to wi-fi. Had the weak security message on devices. My Samsung phone and laptop can connect, but have been kicked off a couple of times. iMac, ipad, a printer and my wife's Samsung phone are refusing to connect at all. We've done the WPA switch as recommended. My phone, daughters ipad, Laptop are connected. The old iMac, my wifes phone and new ipad still refuse to connect. My wifes phone 'failed to obtain an IP address. They use different operating systems, which makes no sense as our daughter's 'old' ipad works fine. Any ideas?