I'll never understand the simple minded thinking that some people have by saying that more rules, and regulations are the answer. Childproofing the world is never going to solve problems. At best it merely prolongs them. Most dive operators are going to be more interested in money anyway. They don't really care what type of regulator you use for a dive. This is only going to create more confusion when it comes to safety issues.
Educating divers, and manufacturer liability is most likely the only thing that will bring a solution to a problem like this. I've been using various models of Sherwood Regs for years in waters near freezing temps. and have never had a problem with freeflows, so obviously it is possible to make a reg that doesn't have this problem. The Scubapro reg that I mentioned earlier was put on the air bench, tried again by a very experienced, Scubapro technician, and very conservative (air) diver afterward where it continued to freeflow at 80 plus feet. My hunch is that ScubaPro knows this is a problem but is failing to recall these regs, or fix them most likely because the vast majority of divers are not using them in near freezing temps.
Bottom line is: Are you willing to trust your life to something that is showing signs of letting you down when you need it most? (at depth) This isn't like your car breaking down. When your car breaksdown you coast to the side of the road most of the time where it is usually safe, when your regulator malfunctions you might as well consider it like being it in a plane with engine failure. You might live through it, and you might not.
Are you really willing to take the chance? I would take the dang thing back for a refund, or replacement if it continues, or trash it and buy something that functions correctly for these conditions. Sorry, but I don't see how this could be a difficult decision.
Splash