There clearly is a problem as I've been experiencing the same problem, and there is more than 1 box in this household.
To clarify when the issue with Netflix occurs the box has no connection. This can been seen when 1 looks under the networks option and commit test network. The issue resolves itself in most cases. But only after waiting a few minutes and may continue to interrupt whatever is being watched over Netflix etc.
I also found if 1 reboots the box it might not want to boot up for some time. In other words it's not booting up as expected. Workaround this iss7e 1 has to unplug it and wait a few minutes before powering the box up again.
The connection is established in most cases at this point and can resume streaming over Netflix. However the issue will reoccur over and over.
My box is also connected to the LAN of the router, which does have constant connection. However this also doesn't seem to remedy the problem.
Normal cable channels seems to be unaffected by the issue. Leads more to believe it's an firmware related issue and not necessary related to the connection itself.