I haven't done a CYA test in about a month and when I did I noticed that it was lower than 30 (it was 60). Initially I thought I had a false reading and retried the test with the same results. Upon reading here about people loosing CYA when they have a FC level of 0, it occurred to me that this happened to me. Long story short, my flow sensor cable was snapped (overly friendly dog chasing rabbits), which caused my SWG to stay off and I did test my FC to be 0; hence the cause and I corrected the problem (currently producing Chlorine). At this time, there were no visual indications the pool was anything but normal (other than the test results).
I am assuming that this is what happened to my CYA and the only thing that I did not find is if there are any other issues (of the CYA being consumed by 0 FC) that I need to be aware of or address? I did add some CYA already (all that I had on hand) so I am waiting to retest after 1 week to see how much more I need to add.