  Various physical systems relax mechanical frustration through configurational
rearrangements. We examine such rearrangements via Hamiltonian dynamics of
simple internally-stressed harmonic 4-mass systems. We demonstrate
theoretically and numerically how mechanical frustration controls the
underlying potential energy landscape. Then, we examine the harmonic 4-mass
systems' Hamiltonian dynamics and relate the onset of chaotic motion to
self-driven rearrangements. We show such configurational dynamics may occur
without strong precursors, rendering such dynamics seemingly spontaneous.
