Lost 31 lbs of CO2 while on a 16 day vacation. Prior to that I had my system set up perfectly and gone through about 4-5 kegs with no issues at all. I took regular weighings and other checks to be sure I had no leaks. Then, I go on a 16 day vacation and out of the blue...kaput! Tanks is empty? After 10.5 hours in the car I was looking forward to a cold one. Has anyone ever had this happen?