Loss of air pressure
Kissarmygeneral:
Coming from a whitewater guiding background one suggestion for your possible loss of inflation maybe this: If you pump any inflatable craft up on a hot day and leave it sitting in the sun while dressing etc it increases in pressure and feels hard enough but as soon as you throw her in the water the colder water temps that we enjoy (??) in Alberta will condense the air inside the bladders and drop the pressure. Ideally you can pump your craft to the pressure you desire then pour a bunch of cold water over the craft thus condensing the air enabling you to top it up before hitting the lake or river. This works well. Not saying this is what you may be experiencing but is common with any inflatable craft. If you use this method however and maybe leaving your craft onshore for some time in the sun keep and eye on the pressure to avoid blowing your tubes.
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