ESP light on and off?

Hey..
Golf plus 06 plate 56000 milage.
Esp light came on again...
Same thing happened to me last year.Kept comming on for copule of weeks and then was fine until now. Strange thing, only when I'm driving up the hill(exactly the same spot on my way to work). ESP light is comming on. Not affecting abs/ driving at all. ESP button doesn't respond. When I switch the engine off and on again ESP light is going back to normal. Everything is fine.
Any Ideas?
Done my research an I'm aware of the common problem with VW ESP. No Idea what is going on..