I've only had a Merc for a a few weeks and today was the first batch of heavy rain. Had the wipers on 2 setting and was happily driving along until I stopped at the lights. The wipers also stopped. Thought this was a problem until I realised after a few stops that the wipers stop when I stop and start again when I pull off. Really annoying, because the rain was so heavy, I couldn't see a thing when I pulled off from the lights. Can I turn this off?