KS8s clicking and static in a high humidity environment

I have KS8s and I’m hearing a clicking or static sound from my right aid when I enter a high humidity environment. This time of year, here in Florida, that’s whenever I go outside. I asked Costco if it could be the receiver. The answer was Rexton doesn’t service the aids because they are more than five years old. Any suggestions on the cause and can this be fixed. I’d like to get some more mileage out of these aids if I could.