@greeneyes21 Are you able to access the router web GUI when you are outside from the router network? You can try to enable the Remote Control on the router to check if you can modify the profile...

@Ned01 May I know what is the phone OS version, and how about the Deco app version? We will check this.

@Sigfrid_Xanten Hi Sigfrid, when you mention the offline schedule feature, do you refer to Wireless Schedule feature on the Archer C7? Do you mean that when the Wi-Fi is set to be off, but there are...

@Daryl_C80 Hi, it seems you asked this before, please check: https://community.tp-link.com/en/home/forum/topic/226996

@LordBeerus Hi, may I know what is the speed or bandwidth you paid for the ISP, and what is it when connecting the PC directly to the ISP modem? If the modem speed is good, please check the settings...

@Daveron Hi, except the router firmware upgrade, are there any other changes in the network? Who is your ISP? Please try to change the DNS settings on the C80 WAN/Internet to something like 8.8.8.8...