Root Eating Bugs Annual Flowers

Question

Every year I plant my annual Pansies and the like. As time goes by, their roots end up being eaten. We have dug up old soil and put down new fresh soil, yet, something is still eating the roots of the flowers.

Answer 1

As you didn't mention what the root eaters look like, this is some general information:
https://www.gardeningknowhow.com/plant-problems/pests/root-eating-insects-identifying-vegetable-root-maggots-and-root-maggot-control.htm