599 wipers problem

Hi all, got a 599 where the wiper stalk doesn't really operate correctly. When I push it upwards it doesn't always set the wipers in motion (it's pretty random). When I push it down a notch, the wipers goes into auto mode and that seems working, a further push down they go into continuous motion, a further push down (fast motion supposedly) and nothing, the wipers stop.
I wondered if I should buy a new column switch but then I heard about someone who had a similar issue, bought a new column switch and that didn't solve anything. I can't contact that person though.
Anyone had this issue and how can I check if it's the switch or something else?
Btw, the switch doesn't make any weird noises, ie it doesn't sound/seem the switch is broken on the inside.
Any views appreciated.