I have had similar type incidents happen to me but always due to my own inattention (not completely reading the instructions and thinking that I "know what I'm doing").
I'm sorry to see Yankee Candle retire the Fragrance Fan. The battery that came with mine lasted three years; I also did not put mine directly on the sideboard or dresser -- I used a coaster. That wasn't in the instructions; however, it's how I roll. I never set anything on top of my television nor on the stand or the shelf below (except for the cable box and dvd player. It's electronic equipment and I treat it with care considering how much it cost. But that's just me (learned by experience from drenching a keyboard with a large cup of coffee, with sugar and cream).
As for the Yankee candles, I use a candle warmer, change the candle (scent) every now and then (or seasonal) since one becomes used to the scent. Plus, I've noticed that Yankee candles seem to burn more "dirty" (soot-like?) than soy. However, since I don't like fire, I rarely burn candles.
I think the Yankee Candle plug-in (diffusers?) are the best I've come across scent-wise, but are quite expensive. Every single brand I've tried will and has ruined a hard-wood floor (my own fault); so I don't think that is unique to YC and I have the spots to prove it.
BTW, I've only found a couple of soy candles that fit my candle warmer, and the scents don't seem to be as varied (since I don't like vanilla, coconut, peppermint). I've even tried adding scented oils -- expensive and doesn't help; can't use reed diffusers since the felines think the "sticks" are a new toy for them.
Sorry for the length: bottom line: YC is expensive and I generally only buy it when I have a gift card. Every time I ruin the floor/counter/etc., with one of these oil-scented contraptions, I could kick myself since I know better. MOO.