I recently relocated to southern Florida from Seattle. My Sherwood Oasis has served me well for 300 dives, 6+ years. However, I've noticed recently that my mouth gets terribly dry while breathing from it during a dive. It did not do that in the chilly waters of Puget Sound. In fact, the Oasis is designed so that it will collect a little condensation and "moisten" the air coming through the second stage. Could it be that this does not function well in warm water? Or is there something else wrong?