How to keep the frozen drink frozen?!

How to keep the frozen drink frozen?

I have a great recipe for frozen pina coladas but every time I make them they become liquified towards the end and I would like them to stay frozen the whole time. Its not a question of am I drinking them too slow, because I'm not, trust me. 6oz captain morgan spiced rum, 6oz creme of coconut, 8oz pineapple juice by dole, 1banana, 4cups of ice. i already tried more ice which just ruins the flavor. Any ideas would be worth a try.thanks

1 day ago
Im sorry, I should have clarified. The drink melts..........rather most of the ice floats to the top and a liquid layer about 2-3 in. up from the bottom forms....................in the glass after they have been served, not the pitcher, which of course I put in the freezer until someone needs another. I like Einstien's answer right now,"ice cream"

23 hours ago
einstien is way in the lead

Forget the ice... try ICE CREAM instead. Does not melt as fast due to consistency and even when it does "melt down" it does not "water down" the drink. Also... it tastes 10 times better. I use plain ole' Bryer's Vanilla... but have used Pineapple Sherbert in the past and that will certainly do in a pinch.