After inserting the key and attempting to start the engine the panel lights come on and the wipers start uncontrolled and will not stop - wiper switch is off and has not be selected. The only way I have found to stop the wipers is to disconnect the battery. I leave it for a short time and reconnect the battery. So far when I now start the engine all is well.
May be a faulty wiper stalk / switch but could check if known fault that software updates/downloads that may correct fault . Either that or scan with suitable scanner that covers your vehicle and all systems / modules for any stored fault codes
Water may be a problem as we have some heavy rain just lately. I will check in the morning. Having said that I have used the car today without any problems. It is clearly an intermitent fault which makes it much harder to find/fix.