I have a 2006 Prius that is unreliable when it rains.

I have a 2006 Prius that is unreliable when it rains. By that I mean most of the time it runs fine, but 3 times now after I start driving in the rain for about 5 min, the Caution, anti-skid and tire lights comes on. The car will keep running, but if I Stop and shut it off, it will not start , all the dash lights come on and the car will not start or go into Drive. After the rain stops and dries out for 2 days, it starts like nothing happened.