Shoes retain sand, does not stay on in ocean - Vibram FiveFingers V-Aqua Water & Boat Shoes - Men's

Originally I really enjoyed the product using them for rafting trips, and river crossings on hikes 3-4 times....but on a recent trip to Maui I wore them doing the road to Hana. Found that they really retained the sand. And even worse went into the ocean and when a moderate wave it forces the shoe loose and it never resurfaced! Had to do the rest of the trip with 1 shoe. Shoes Definitely do not have a good tight seal/fit for water shoes.