CRJ900 FLT CREW REPORTS AUTOPILOT DISCONNECT AND STALL WARNING AT FL390. FLT CREW DESCENDS WITH INTERMITTENT STALL WARNINGS THROUGH FL280 AND DECLARES EMERGENCY. AFTER LANDING; ALL BAGGAGE IS FOUND LOADED IN THE AFT COMPARTMENT.

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THE EVENT HAPPENED DURING CRUISE FLT AT FL390. WE FIRST NOTICED ALT FLUCTUATIONS OF 100-150 FT. MOMENTS LATER; THE AUTOPLT DISENGAGED. THE CAPT THEN RE-ENGAGED THE AUTOPLT. APPROX 10 SECONDS AFTER THE AUTOPLT DISENGAGED FOR A SECOND TIME; WE RECEIVED A STALL WARNING ON THE CAPT'S SIDE ONLY; BOTH STICK SHAKERS; A STALL FAIL CAUTION MESSAGE; AND A RED AIRSPD TAPE INDICATION. THE CAPT THEN IMMEDIATELY STARTED A DSCNT WHILE I CONTACTED ATC AND ADVISED THEM OF OUR NEED TO DSND. ATC GAVE US A LOWER ALT OF FL340; WHERE THE CAPT LEVELED OFF AND RE-ENGAGED THE AUTOPLT. WITHIN MINS; THE AUTOPLT DISENGAGED; AND WE AGAIN RECEIVED ALL THE STALL INDICATIONS PREVIOUSLY MENTIONED. AT THIS POINT; I WAS INSTRUCTED BY THE CAPT TO DECLARE AN EMER AND REQUEST A LOWER ALT. WE WERE GIVEN FL210. THROUGHOUT 3000 FPM DSCNT FROM FL340 TO FL280; WE WERE RECEIVING ALL THE PRIOR MENTIONED STALL INDICATIONS. THIS SECOND OCCURRENCE LASTED 30-40 SECONDS; NEARLY TWICE AS LONG AS OUR FIRST STALL INDICATION. THE STALL INDICATIONS CLRED AROUND FL280. WE CONTINUED OUR DSCNT TO FL210; WHERE THE AUTOPLT WAS RE-ENGAGED. THROUGHOUT OUR DSCNT; I WAS WORKING WITH ATC AND OUR DISPATCH; VIA THE RADIO AND ACARS; TO FIND A SUITABLE ALTERNATE. WE WERE ASSIGNED ZZZ AS OUR ALTERNATE. WHILE ENRTE TO ZZZ; WE REVIEWED THE APPROPRIATE CHKLISTS. THROUGHOUT THIS TIME; THE PLANE APPEARED TO BE FLYING NORMAL. CFR WAS REQUESTED IN ZZZ. WE LANDED WITHOUT ANY FURTHER PROBS. UPON DEPLANING; THE CAPT WAS INFORMED BY THE GND CREW THAT ALL THE BAGS WERE LOADED IN THE AFT CARGO BIN; LEAVING THE CTR AND FORWARD CARGO BINS COMPLETELY EMPTY. I BELIEVE THE EVENT OCCURRED DUE TO THE FACT THAT ALL THE BAGS WERE LOADED IN THE AFT CARGO BIN; LEAVING THE FORWARD AND CTR CARGO BINS EMPTY. THIS NEGATIVELY AFFECTED OUR WT AND BAL NUMBERS AS WELL AS OUR CTR OF GRAVITY. I BELIEVE THAT WE NEED TO BE GIVEN CARGO WTS FOR EACH INDIVIDUAL BIN IN ORDER TO VERIFY THAT THE BINS ARE LOADED CORRECTLY AND EVENLY.