I'm prone to low back episodes also. Generally it happens when I let my back round during squats, I'm much less likely to hurt my back deadlifting.
A belt helps, but mostly it's just a matter of knowing how to keep your back in extension, and remembering to do so.
99% of people can squat correctly w/o rounding their lumbar spine with coaching alone. No stretching or hip surgery required. Do you have a coach?