Recently the 6 has developed a rather annoying starting issue. It will start from cold no problem, but i just know that when i stop and turn off the engine like when i stop for fuel, it will not start up again By this point it's obviously hot. I then have to push and bump start it. It does however start when it has cooled right down. Anyone know what this could be? The Battery seems to start it, but slowly. So perhaps it could be the battery? I have a sub & amp which could be drawing too much power away and not charging the battery enough?

Any other possible causes?

Ste