This happened on an esprit 3 of a friend of mines. Its the pot joint not centering properly.
If you go into the menu there is a setting there called "adjust vr", enter that then move the stick to full throttle and record the number it centers at, then go full brake and check the number it centers to again. It should be within 2-4 digits, if not then the pot joint will need replacing.
If the number is low, and its still doing it, you could always try increasing the "neutral band" on the ESC (if available).
Hope this helps.
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