Sudden drop in speed and altitude?
Smooth descent at 1500 feet per minute from 30,000 to 11,000.  Nothing unusual.
Or was there a blip somewhere in the data that I scrolled past?  (Where?)

Edit: The blip at 13:16 is from 36,000 to 29,600 and back, in less than a minute.  A 12,000 fpm dive followed by a 12,000 fpm climb (and vicious G force at the pull-up) is probably impossible for an A320-232.