Hey so this is an Audi a6 2.8 quattro from 99 and whenever I bring it to a high speed(over 70 km/h) it gets really hard to steer the wheel(almost imposible to do it with just ur fingers), but right after I stop at a light it steers like butter again, anyone know if this is a problem and if so whats causing it and how it can be solved? Thanks in advance.