Your WR710N is working in router mode? Is it connected to your modem by cable connection? Did you try to connect the notebook to its LAN port when Wi-Fi crashed? Try to figure out cable connection to...

Cable connection from PC to WR1043ND is still working? After change the password, when you reconnect the Wi-Fi, you have have to forget the network first and then connect with the new password. If...

Update iOS of your iPad. Change channel width to 40MHz and ensure the network is secured with WPA2-PSK, AES.

You are suggested to contact VoIP provider to check the line first. By the way, you can ask for some suggestions from the support and make some changes on the router.

The function only works with mail account using port 25. Gmail is not. Not sure about the yahoo one.

I'm afraid not. Normally we can save the config file as a backup. But the config file of WDR4300 will cause some problem if you upload it after upgrade, which has been reported by many users on this...