Some people already mentioned here on the forums about a bug with stopping wipers. As far as I remembered, this was on the new TSW6 routes. Today I came accross this bug on Dresden - Riesa (yes the old route) with the BR143 in the snow. The right wiper stopped working, the left one was still going. Very anoyning bug, as you can't see a damm thing when it's snowing. Can this please being fixed soon? I don't know if this is a Xbox specific problem or not.
I would report such things as errors in any case. Since TSW already has a lot of errors, and every new route has more errors, it is usually an error.