I don't have a solution; just an observation on the original status.
When you get smearing from Diesel fuel on the screen the streaking causes the sensor to see 'heavy rain' and then the wipers just get faster and faster as you observed. A short journey down a motorway full of trucks is enough to get diesel on the screen. The remedy is a Cream Cleaner to cut through the build up.
So what you have now is just a failing sensor or the connection to the software.
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