Does anyone else have this problem or know how to fix it?

When I press the wiper stalk down to operate the wipers for 1 wipe if i let go of the stalk the wipers stop. I would of thought that these would automatically finish off the action.

Also i've noticed that if you put the wipers on the first setting if you return the stalk back to off the wipers stop in the middle of the screen. Are these problems related?

Is this a dodgy wiper relay or something more sinister?

All help and advised is greatly appreciated!

Thanks