Hi, Some times when I try to start my mazda rx8 it just wont turn over and the engine wont crank. I turn the key and I hear a single click noise. However if I turn the key back and forwards a few times it eventually starts. Some times it starts no problem and other times I just get that single click noise and have to keep turning the key back and forwards till it catches and starts. I suspect this is a starter motor problem, anyone else confirm this or is it something else?