I've noticed them this past Summer as well on my set that I received in February of this year. My main source is my Playstation 3 via HDMI which is used for streaming (Netflix, MLB.TV, Hulu Plus) and Blu-Ray playback. The FBr has returned on everything and has only stopped while watching compatible sources capable of engaging Cinema Smooth (e.g. 24p playback).
My simple settings are below:
Black Tone off
Dynamic contrast off
Expert pattern off
RGB only off
Edge enhancement off
Motion lighting off
Any recommendations? Though it appears this is truly a problem as mine were gone for about 800-1000 hours before returning post logic board update shortly after receiving the unit. While I recall the FBr being worse before the initial logic board update, it has certainly returned and while not AS bad as I remember, still pretty terrible and I'm fearing it will get worse (e.g. to the point it was when I first received it and had not yet applied the update).
I really wish Samsung would address this, or at the very least offer us a upgrade path to the E-series (like switching to a 60E8000 for $500 or something). Of course, ideally this would be covered by warranty and they'd either find a permanent fix or offer us a E-series as they have done with some people on this forum it sounds like.
Also note, I don't comment on here often and mostly lurk - but this issue is so huge in my opinion that even I couldn't keep quiet and had to chime in. My previous Panasonic Plasma never had this issue, or at least not to an extent I ever noticed (2007 or 2008 Costco-specific model). Now I'm regretting not going that route again with a ST/GT30 or waiting for the much improved ST/GT50's.
For a few glorious months however, this TV has been wonderful - and in some cases with Cinema Smooth engaged it still is - except Cinema Smooth on the D-series causes noticeable worsening of blacks, which is something else I think the E-series rectified (but of course, doesn't help us...).
ETA: The FBr is much more noticeable/distracting in 4:3 or letter boxed content (aka anything that's not 16:9, though 1.66:1 and 1.85:1 aren't bad). Unfortunately, that is a majority of the content I watch...