Doug, the 'reproduction of a system' was not really in doubt in 1929-32, but capitalist 'crisis' was not a bad description of those years, surely?
Why not advance to the Robert Cox definition which - I'm nowhere near my copy of Production Power and World Order - if I recall is that a 'crisis' sets in when the system's natural self-corrective mechanisms no longer work to stabilise or equilibrate the system, and problems get worse, hence requiring an *external* 'solution' to (or at minimum displacement of) the problem that is contrary to the system's internal logic.
So a major stock market 'correction' which devalorises vast sums (was it $7 trillion for the dot.com 'crisis') would represent such a state.