Brake Lights,Brake light switch continuously fails

My brake light switch has failed more than five times in the past few months. It always seems to fail when the car is parked in the driveway and it is raining but not every time it rains. There seems to be no apparent correlation between switch longevity and weather patterns. I hit a deer over a year ago and replaced the front clip myself but had no issue for about a year. I have been all over looking for shorted wires and have been unsuccessful. Help please!

My car has 136000 miles.
My car has an automatic transmission.