Strange Gremlin 570 2011?

we were out on a ride , pulled up in th bush , shut engine off ,got off bike, others around , all other engines off, then ... capoof the engine must have fired the spark plug , the headlight flashed on apparantly , then no other strange things all day.
anyone heard of this one ? any ideas?

Thanks
The battery terminals are all tight , just checked them , inc all the start solinoid terminals while i was there ,
the other theory sounds logical too.

No strange ones after the ride this weekend, and really think it was just that chance of the tdc thing , it still doesnt miss a beat and i could honestly say it is by far the best bike anyone could want except for the rear guard being too small and letting mud down your back and all over the seat on steeper clay downhills.
Husadan,
Ps the forks are awsome, and i didnt notice any diff on my mates 2010 at all
However i didnt realise how smooth and still effective they are with the clickers wound off, rebound and compression, basically no jitter on the bars, saves the arms on the rocky trails and soaks up the bigger bumps and still takes a reasonable bump to use all the travel. Allows me to hold it on longer , No complaints on the forks for me , would like to hear your comments.