What's the current frimware of your router? If it's 170630, then you can update this beta http://static.tp-link.com/Archer C5400(US)_V2_170801_beta.zip Do not restore the backup file because that may cause problem on firewall settings.

thank you that worked for me I did use my backup file just to see if it would save the firewall settings and it did I give it some time to see if I would have any more issues and I havent so maybe they got it right with this firmware still in beta what I did I updated to the beta firmware you supplied than backed everything up using my backup file from the previous 170630 firmware and then restored back to the 170630 firmware and its working great :p

Hello,

today I tried to set up my C5400. It turned out that there was only an internet connection to be established when I enabled IPTV due to that my ISP sends on different VLAN ID from the modem. Whenever it was turned off the C5400 wasn't able to communicate with the modem and didn't established an internet connection over PPPoE. Here the modem should scan by itself on what VLAN channel to set up the internet connection or give the possibility to select the desired one. Now another problem to me is that there is no chance to assign the IPTV VLAN ID to a specific WLAN. There's only the option to assign it to specific LAN ports. Will there be the option to do so with comming firmware? It really would be reat deal.

My C5400 also loses settings in the firmware when the power switch is turned off. Also the 2.4GHz radio is defective.