You need to pay attention to your poster while riding. Try not to tense up. I find myself doing that all the time.
Shoulders relaxed, upper arms downward as much as possible. If you rest your hans on the grips, aline the bars to the natural angle of your wrists.
You don't want to reach too much but don't want the bars in your gut when turning. Getting tense is the big factor. You don't realize when your doing it.
Happy riding