Well, you can't really blame FR for the fireplace - they don't make them, just get them in by the container-load from some third party (just like I didn't blame FR for the stuck column of red pixels in the Toshiba TV).
That said, my dealer did go to bat for me with FR and got my fireplace changed even though they couldn't reproduce the problem. It wasn't dangerous, it just had a mind of its own as to whether it wanted to play dead in the middle of the night or when you wanted to initially turn it on from cold - usually when you wanted it the most.
So it kind of depends on the relationship your dealer's service department has with FR and how persistent you and they are.
Now I do blame FR for the fallen-out screw causing the open plenum on the back of the furnace, which made us dependent on the fireplace and thus the flakiness so much more annoying, but I found and fixed that one myself.
2015 Rockwood Signature UltraLite 8282WS Platinum, GY Marathon LRD, TST 507RV TPMS
2005 GMC 2500HD CCSB D/A, Curt E16, Prodigy P2, Garmin RV760LMT w/BC-20 b/u cam