Here on the telly in BKK, Richard Quest of CNN International is reporting a statement from the Brazilian Air Force indicating a report of "loss of pressure" from the "automated system" aboard the plane (presumably ACARS).
This is said to be in addition to the reports of turbulence and a short circuit in the electrics. The implication of the story is loss of cabin pressure, though I know how the media can get things wrong, especially when translating technical material from other languages is involved.
No fan of RQ here, and I have to consider the source. I mention it only because it's something I haven't heard reported thus far. (I am only reporting, and not speculating.)