Buck-Boost troubles: 5v output becomes 20v+ if input drops below 3.5v

@gilshultz Thanks for the suggestions. Apologies for being a noob, but in terms of 'bulk capacitance, do you mean something like a 1000-10,000 uF Electrolytic capacitor? Similarly, is the 'High frequency bypass' a small ceramic capacitor? I assume I just put these straight across the input and output terminals? What change in behaviour might I expect? Thanks!

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