I really like my Planet Bike Superflash but every time after I ride in the rain, the switch quits working properly and I cannot change modes. In other words, when I insert the batteries, it starts blinking and I cannot turn it off or change it to steady mode with the switch. The gasket and mating surfaces for the gasket are fine, it just seems like a design flaw. I could definitely weatherproof it with silicone caulk but then I wouldn't be able to access the batteries. Has anyone else run across this problem?