You are not alone, Mahone82!
I have exactly the same issue. I thought my wipers turned on because I activated Autopilot at night, even if the roads are dry. Recently, I discovered it’s when I activate cruise control at night, even on dry roads, too. Wipers will start 90 % of the time at night even if the road is dry. So annoying. Takes away all the pleasure of using CC and AP. And it’s a big distraction when driving. Trying to disengage the wipers takes your attention off the road. When wipers don’t start right away upon engaging CC or AP, they’ll sometimes start when a car passes me and stay on for quite a while, even if the road is dry. Sometimes wipers will stop automatically after 10 or 15 minutes but most times not.
During the day, this rarely happens except sometimes when going under an overpass. It seems like the shadow tricks the system into believing it’s nighttime. In this cirumstance, the wipers will usually turn off almost as soon as they turned on.
Could it be the automatic wiper sensor that is defective and mistakes the darkness for moisture???
I would really like to have this issue resolved cause it’s a real pain in the a$$.