There might be higher water pressure where you were this weekend, vs. where you did the prep. Small leaks will appear when higher pressures are encountered. One "fix" is to use a pressure reducing inlet valve set to a pressure that you KNOW is good for your own unit. If you are on a well, at home, it's likley that your home pressure doesn't exceed 50 psi, but pressures well over 60 psi are found on many water systems. And if you happen to be near the end of the system, "water hammer", from someone rapidly closing a major valve, can cause leaks to appear where there previously was no leak.
2014 RAM 2500 Laramie 4x4 Quad Cab w/Cummins Turbo Diesel, 2009 Rockwood 2607, and 3 'yaks!
300W of Suntech Solar, a Rogue MPT-3024 Controller, and a Xantrex PW2000 Inverter