I just bought a kegerator and have decided to jump into kegging my beer. I've figured out a lot of the process, but I still have a couple of questions. First, I've figured out the pressure I need for forced carbonation. I set it on the regulator and leave the beer in the kegerator. However, frequently, when I come back after some time, the pressure on the regulator is significantly higher than what I had left it at. What's going on? Is this normal or a malfunction? Should I somehow compensate for it initially, or do I just have to come back often to readjust the screw? Second, once the beer is fully carbonated (and I'm still not sure how you know when that is), should I just shut off the gas line to hold the pressure in the keg stable? Do you then just open the gas line at serving pressure (10 - 12 psi) when you are ready to serve a beer? Or do you keep the gas lines open at all times, but at the lower, serving pressure? Thanks.