MKJP-KMIA AAL1376. Leveled off at FL320 .There was a sudden change in the Altimeter. Wind speed suddenly dropped and my Altitude suddenly fell from FL320 to FL170 instantly, Aircraft did not descend. Groundspeed registered at 430 though but my Airspeed was showing 160. Stall horns alarmed. Never could regain altituded and Equipment was rocking back and forth. My trims could not be steady and I am having a bad time keeping her level and stable. Sieara Maestra was my closest Airfield. Step up speed by tipping the nose while trying to play with the A/P. Each time its activated, she gets out of control(Trims). So forget it. Nasty touch but safe on RWY 26. This must be a ASA issue.
vNTSB: Weather related issue.