
Hey, that sounds frustrating, especially for camping trips where you need a good night's sleep. First off, if you can't spot the leak, try submerging the inflated mattress in water or using soapy water to look for bubbles; that often reveals tiny punctures. Patching it yourself can be a quick fix and save you the hassle of returning it, as long as it's not a manufacturing defect.
I've had success with the air mattress patch kit for similar issues. It's waterproof and comes with 80ml of adhesive, which is plenty for multiple repairs, and it's designed for vinyl materials like your mattress. Just clean the area, apply the patch, and let it cure; it should hold up well for outdoor use.
If the leak persists after patching, it might be worth contacting the seller for a replacement. Hope this gets you back to comfortable camping soon!