Hi, my freelander front washer / wiper has just developed an annoying problem. If I use the stalk to operate the washer/wipe or if I press the stalk down for single wipe then the wipers do not return to the park position, they stop as soon as I take my hand off the stalk. Also, if I use the intermittent wipe the wipers operate, but once again they do not return to park position the stop at random positions on the windscreen. Any help would be great.