When I fire up my smart TV or my Xbox, it says "no internet connection" however both of these devices are hard wired to the router. If I perform the usual unplug, wait 30 seconds and plug in again, these wired connections work again. I cannot for the life of me figure out why this is happening. Does anyone have this same issue?
What does the Actiontec interface (192.168.1.256) indicate when these devices are not connecting - do they still exist in the list?
Have you tried assigning a fixed IP address for each of these devices?
On my smart TV I changed the default connection from 'wifi' to 'Lan' and it seems to be working better, albeit Netflix not always working on the first shot and just requiring a reset. I am going to fiddle with my xbox a bit but may just permanently switch it to wireless for ease of use.