Subaru Forester starting problems

On several occassions,the car has been reluctant to start,inside the garage even. Even after cranking for long periods. Latest episode involved me calling subaru assistance who came after 1 hour and of course,the vehicle started second crank,advice from them was when garaging the car do not switch off the engine until it has run for a few minutes! (taken with a pinch of salt!)I see on the internet several owners with similar problem and the only mention of a solution was a dealership recall to up-date software,I cannot believe this is the cure?