Hi HooDad,
A number of people have posted about their Dometic Air Conditioners leaking freon which requires replacement of the unit. A few more than once. Reportedly, Dometic moved manufacturing to a new location and the tubing quality suffered. From what we've seen here, they have corrected the problem, but as you say, there may be units like yours that are just now failing.
I believe Dometic has a 2 year warranty on the A/C unit, and if you're past that, I'd suggest calling Dometic Customer Service to discuss how they might help.
Recalls are usually for safety issues. So I wouldn't expect a recall notice on this issue.