|Is your router a couple years old? Is your blueray connecting to said router via a wired or wireless?|
In my experience, SOHO routers can have what I call a "brain fart" and just stop functioning properly. Typically in these cases, recycling the power fixes the issue. Over time, the unit will "stuff up" more and more frequently until it bricks permanently.
Usually this happens with the wireless side of things before it'll ever happen with the wired. I have a SOHO router that's about 10 years old and the wireless on it died on me some years back so I disabled it completely and plugged an really good wireless access point into the router. The wired side of things is still working perfectly but as I said, the wireless radio died.
Remember, you're dealing with SOHO level equipment here and manufacturer's don't put the same effort into it as they do enterprise level equipment so it won't perform as well, or have as long a life.
Also, plugging the ethernet in before powering it up won't make any difference. The switch ports (be they LAN or the WAN port) are pretty much the last thing to enable after recycling the power. When my older unit's wireless starting to die, I just pulled the power plug, waited 10 seconds, then plugged it back in to do a quick reset. Unplugging the ethernet cables was/is a waste of time and changes nothing with regard to how the router boots up.
It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.