There could be a couple things at work here. The most probable issue is that your BD player is not receiving adequate power. Try changing where you plug it in and see if that helps at all. If not, i would also suggest trying to update the firmware. There may not be anything wrong at all with your player, but its always good to be on the safe side. Try these steps and see if they work out for you.
I watch nightly on Netflix and each night I have prompt telling me that my BDP has been deactivated by Netflix and need to re-Activate. I do this and player works fine. I turn player on and off from the red power button on the remote; I never un-plug the unit. I see threads in forums talking about this problem occuring with power cycling but they appear to be discussing unplugging the player. My case it's just turning the player on, off from the remote that causes it. No other setup seems to be lost. Pandora has no problem (so far) and the connection to my wireless is not lost.
Any guidance appreciated