Anyone out there have problems with their 2011 RMR raft floor holding air? Have never been able to get mine to stay nice and inflated. Have changed the pressure release valve twice and done multiply hot soapy water tests on the floor, with no leaks. The boat has about 50 days of use on it. It will hold air pretty good on dry land but as soon as its on the water it goes very soggy within 30 minutes.