My wipers have also stopped in the middle of a storm. Dangerous!
I took my is300h to the dealer and they said there was nothing they could find to explosion the issue.
Then I noticed that my radio speakers aren’t working, and correspondingly the warning sounds from my gps.
Back at the dealer again, they still couldn’t find any fault. But they did advise me to book a full diagnostic.
Strange that Toyota/Lexus hasn’t comethis more often.
Any valid suggestions from you?