Prejudice in problem solving is caused by lazy thinking. When we are pre-disposed to a particular solution, we need to be careful to avoid simply assuming the previous solution is the correct one this time also. This is related to the "beginner's mind".
How do you strike a balance between re-creating the wheel every time a problem comes up and re-applying the same solution? It has to do with lazy thinking. If you carefully consider a problem instead of jumping to conclusions, it doesn't cost much in terms of effort and will help avoid overlooking potential new solutions or new wrinkles to an old problem.