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Sounds like a seal problem. I've got a ST4000XCM. After a year or so of vigorous use it started to frost. More and more over time. I did the normal plug recharge and it has been frost free for the past year+. No special bags, gas, etc. The o-ring seal is the key to this, unless there is a leak elsewhere. I don't know enough about the guts of the camera to know where other leaks could be. Good luck..
Rob
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