There can be many reasons that a crawler harness twists. If you are constantly having this problem, first check that you are using ball bearing swivels as your connector between the main line and the harness snell. Second use an adequate line weight for the snell itself; I usually use 14# Berkley Vanish Fluorocarbon. Third, you may be trolling with too large of a spinner blade, the largest I use is a #6, usually a #5. When using blades this size go no faster than 1.8 mph. It is common to get snell twist when trolling too fast, however the most common cause is from reeling in your line too fast when the crawler is off. If you get a bite and miss it try to refrain from burning that line back in!
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