Actually the dealer just replaced mine under warranty, today, in my 2305. Common problem according to them, switch gets foobared due to wet conditions then freezing, and sometimes works after it thaws, more often it doesn't. We've had several wet then freezing conditions over the last two weeks here in Nova Scotia. Tractor was covered but didn't prevent it.
I've had to leave mine out before in the winter and have had freezing rain and frozen to the seat base but it didn't effect the operation any? Maybe you got water in the electrical connection? slkpk