I’m using WPA2 security on wifi. Both my iPhone 6 and iPad Air occasionally show a message in the wifi connection saying that WEP is not secure and to change to WPA or higher. The iPad mini doesn’t seem to have this problem. I’ve updated to the latest version of iOS (not beta). the router settings show WPA2. Apple support had me recycle all components including ‘forget network ‘. None of that solved this intermittent problem. Anyone else have this issue?