When corn gets too cold after boiling or steaming (it doesn’t matter how long), there’s no moisture left in it but still its cell walls contract making it crunchy when we bite into it . It has no liquid like oil , hence making it hard for us chew on . So next time if corn gets cold try keeping them hot , preferably while still cooking or baking . That way they will remain hotter for longer time . This helps them retain their moisture making them taste better too! You can also use milk instead of water . This helps reduce its sliminess as milk has some proteins which prevents corn from sticking together while being cooked . This works like magic ! In order avoid any corns sticking together , always keep them separate while being cooked ! It's not rocket science , just needs practice! Happy cooking!