my mates xd does the same thing.
i can't remember fully what he told me, but it was something to do with electrical resistance caused by the heat, doesn't send enough power to the starter motor, i think.
If no one else knows the cure, i'll get the info off him properly.
Messa luuuvs messa precious, Moy moy okie day Bilbo! Yousa no taken messa precious! How wrood!"
- Jar Jar Binks in Fellowship of the Rings