I don't know if this could be the "bursting of the bubble" they're talking about. But I think this just just a normal thing with bitcoin. Especially Christmas is coming and a lot of people trying exchange bitcoin to fiat so they could use it.
yes, I agree with you, and I'm sure this will be what you say "bursting of the bubble". christmas day and long holidays will make bitcoin very down.
that's a risk factor. bitcoin prices are volatile and highly dependent on speculation, just calm down and keep track of their progress, do not panic. although down, not necessarily burst, because when compared with the price in early 2017, the current price is still very high.
if it is associated with Christmas and new year, maybe many are btc exchange for them to have fun and holiday with family.