Receiver disconnects from the router every day - DirecTV DVR

For DirecTV TV services which include DVRs and receivers, Receiver disconnects from the router every day I had DirecTv installed a few months ago and a few weeks ago I set up an account with Pandora. No problems until this week. It started out with a message saying the receiver had disconnected from the internet (connected via wireless router). I go through the process of reconnecting; sometimes it takes on the first try, mostly takes 2-3 tries. Now it's gotten to the point where it disconnects after a little while of listening. I've rebooted the receiver several times which always results in resumed reception, only to disconnect again later. Went through a long chat session with a customer service tech yesterday, got it restored, turned it on this morning...nothing.