My V70 has behaved well up to now, but at the weekend I was going down a
very long hill (3 minutesish) and so put the car in Low3 to take some strain
off the brakes.

However when I got to the bottom of the hill  and came to a stop at a
junction I found that the engine had stalled and there was a hot smell
coming from the car. I put it in park and it restarted, although had a lumpy
idle and took another attempt and some right foot to keep it going. Its been
fine since, and the smell went away.

Any ideas what happened, and if I did any damage?

Background info: Sometimes at traffic lights the engine stumbles but the
computer keeps it running. Also, sometimes when pulling up to lights I've
felt it 'push on' a bit and change down a gear, instead of coasting, but I
don't know if all automatics do this.

I was wondering if perhaps the computer didn't bother to keep it from
stalling in L3, so the engine stopped when the car stopped. Or perhaps it
stopped idling half way down the hill and the smell was a hot clutch where
it had been trying to turn a stalled engine. I noticed in the users manual
that you shouldn't bump start the car as this will damage the catalytic
converter - no idea why - but perhaps this was what the smell was.

TIA
Dransfield