I had a red wire failure on my RDS 8000 also. And, like Don's, my wire broke some distance from the solder joint. So a daub of hot glue wouldn't have changed anything. I didn't lose an airplane, but it could as well have failed in flight as during shop setup.
But overall I have to say that my Airtronics radios have been the most reliable brand I've ever seen in 57 years of RC flying. I've seen lots of crashes due to radio problems, but chose Airtronics because they seemed to be the most trouble free. And I still believe that.
Dick