  We use the theory of p-curvature of connections to analyze stable vector
bundles of rank 2 on curves of genus 2 which pull back to unstable bundles
under the Frobenius morphism. We take two approaches, first using explicit
formulas for p-curvature to analyze low-characteristic cases, and then using
degeneration techniques to obtain an answer for a general curve by degenerating
to an irreducible rational nodal curve, and applying the results of
math.AG/0409145 and math.AG/0407445. We also apply our explicit formulas to
give a new description of the strata of curves of genus 2 of different p-rank.
