Every so often my router will no longer allow access into it. I'll go to 192.168.0.1 and get an "Unable to connect" message. Otherwise it *seems* to be working, but it's still a tad inconvenient if I need to do anything, like change port forwarding settings or, well, anything! Doing a power cycle on the router does fix it, but then weeks later it will do the same thing again until I power cycle it once more. It's a Hitron router, and I am wired directly to it.
Again, it's not a big deal, and given how many other issues I've had with your routers this is the least of my worries in comparison. It's just, well, if there's an easy fix I'd appreciate knowing it.