I have a caddis Nevada I only have 2 trips on it. My first trip I went to Perris solo I had an awesome day crushing the bass so I decided to go out the next day with my buddy it was his first trip on his new tube he has a caddis navigator we fished approx. 5 hours but I noticed my tube after 2 hours seemed lower on air then it was when I began both days the second time out I didn't notice my buddy's tube lower on air. I figured it was just the cold water cooling the air in the tube?i have aired it up at home and let it sit and haven't noticed any air loss. I don't hear any leaks it never gets flat just lower on air. I like how it sits in the water when it's full of air. Does anyone have this problem? Do you carry a battery operated pump with you? Thanks for all the advice