Ice is the most common cause of a clogged coil. However, it shouldn’t be happening that fast, especially if you’re running cured material.
It’s possible you have a leak in the system that is causing the ice buildup or another issue causing the clog.
Are you placing the beads in a sock or using any filter to ensure the beads stay put? I’ve seen beads make their way through different parts of a system and cause clogs. If your column has a diptube, you can place a rosin bag over the end to be safe.