@Innocuous I believe that only in HW v2 there's a Reboot Schedule feature which you can use for that purpose. If you don't have that in System Tools then you can't do that automatically.

@PeterBosko Reboot the router after disabling UPnP and test. Do you have any equipment (ISP provided modem/router) placed before the C6 device ?

@PeterBosko OK. Disable DMZ if enabled: Check if the UPnP is enabled. If it is, then disable it and test again.

@PeterBosko If you have enabled the Archer C6 remote management then disable (uncheck enable), Save the changes and test again. Do you have a DMZ configured ?

@PeterBosko What's the device with IP address 192.168.0.197 ?

@peterawilson I presume you are talking about the wireless network names (SSIDs). I would suggest to make these different so you can determine to which device you are connected and for easier...