Sounds like a worn clutch
It's obviously not possible to diagnose problems accurately over the internet. That being said, an F1 dropping into neutral upon normal shift request is the classic first symptom of a worn out clutch. In that case, the frequency of selecting neutral continues to increase until a new clutch is properly fitted and adjusted.
Unless that symptom was present and communicated to FoA when you left it with them, there would be no reason to replace (or even check) the clutch. From what you've said, it could be simply an unfortunate coincidence that you may now be in need of a new clutch. Incidentally, I don't live in the Atlanta area but I've read multiple accounts of good service from FoA.
If it turns out to be a worn out F1 clutch, it should really be installed and adjusted by a factory trained and experienced technician using OEM computer tools and specifications. Any other situation is asking for trouble. I'm not suggesting it should be done at FoA (I'm sure there are competent independents in your area), but you will be much better off with someone who is properly trained, adequately equipped and has done it before.
"Fear of guns is a sure sign of retarded sexual and emotional maturity." -- Sigmund Freud, General Introduction to Psychoanalysis, 1906.