Wow, you just described my exact nightmare.  I'd held a top secret/SCI clearance for 16 years with zero reportable incidents.  I had a my first in 2015, and was told it was being processed.  Fast forward a year, and my clearance is gone.... No explanation given. I even opened an IG investigation to find out what happened, and was told there was nothing wrong with my clearance. I was told I needed a new full investigation, which I submitted over 18 months ago, and still isn't finished.  I had to leave my job, and completely change careers since Intel was all I had expertise in.... Not to mention I gave up 16 years of military service (last 8 were in the reserves) without being able to finish out my 20 until retirement.