Thanks for reaching out about your Netflix query. How things are looking for you at the moment? You're maybe experiencing some intermittent issues connecting to the Netflix application.
Have you rebooted the TV box or the Hub? Both must be rebooted in order to recover the connection to Netflix. And is it the same happening on both wired and wireless connection? If wireless, can you try it on a wired connection and see if it works.
Also try deactivating and then reactivating your Netflix account linked to your DVR. Let me know if you find this helpful.