Why does corn starch dissolve in cold water but gets clumpy in warm water?
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Starches form a gel when warm and wet, which makes them useful as thickeners. However if you drop a lump of starch in hot water the outside of the lump turns to gel first and protects the interior, still powdered, starch. The annoying bit is if you simply try to stir or break up the clump, you keep exposing new starch to the hot water to form new gel layers, getting you nowhere. For this reason in recipes you either want to mix starch into cold water before adding it to whatever how liquid you have, or carefully sprinkle it in a little at a time to give it time to dissolve before gelling.
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