No problems with the bottom ratchets on my Unions. I have the Force DLX. Sounds like a problem with the particular models you had. I've used them for both resort riding and splitboarding in the backcountry. Pretty hard use, but I have just over 20 days on them right now. So maybe I'll have an issue with 'em later.
Sounds like Union has tried to resolve the issue. That is about all you can ask of any company. Everyone has problems with their production runs.