I'm confused, are you saying you have problems finish your 180 rotations or you're having problems rotating past 180 into 360?
It's possible you're counter rotating (swinging your upper body left to get your lower body to turn 180 right or vice-versa) and that could be what's stopping your rotation, but we're going to need a lot more details on exactly what you're doing and what you're trying to do.
Also, video of yourself riding will help a ton, because otherwise a lot of it will just be us guessing at possible problems.
I teach snowboarding via step-by-step videos lessons at
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