Description of sudden departure from stable flight sounds like the typical stall of an elliptical winged aircraft. No warning just snap into a spin and if you don't know how to recover you're done.
Try cranking both ailerons up slightly. For a typical 2-56 clevise it would be about 2 turns. About 1/2 the thichness of the TE of the aileron above the surface of the wing at the end of the aileron closest to the fuselage. This will give "washout" and will make the stall less severe and recovery a bit easier.
Attempting to use up elevator in the spin for recovery before you have stopped the rotation will just lock the airplane into the spin.