I'm pretty new to kegging, only on my second batch, so keep that in mind. A few days ago, I kegged a dark mild ale and set it in my keezer at 40 degrees F, with the regulator set to 10 psi. It stays for a few hours, but I will come back to check it, and the gage will be set 4-5 psi below 10. I will then crank it back up to 10, it will hold, and the process repeats itself. The regulator is from Northern Brewer. Has anybody else had this experience? Any ideas if it's natural, or how to fix it? I used soapy water to check for leaks and found none. Thanks!