samzilla

i just wanted to ask if anyone has had any problems with the gyro in the nav. Is it because of bass? I have 2 12"s and it seems that ever since i had them installed my nav goes crazy. I rarely face the exact direction i am going. I need to know if this is a install problem or a nav unit problem. oh, and the installers moved it from the factory location.... think that's going to be a big problem??