I'm going to guess that SDS imports has about a small platoon for numbers of bodies, and they deal with the Holidays, vacations, and the Winter sick season like every other small business. I'd also wager they are somewhat the victims of their own success when it comes to demand for product and support.
Since Tisas has the buzz as a "bang for the buck" 1911, that is going to attract a lot of neophyte owners as well as perhaps a few old timers eager to find fault with a bargain import, plus factoring in the persnicketiness of 1911 types in general, I bet the customer services reps have plenty to do.
I'm at the point where if the brass insert comes out of my .45 Aviator I'd just think back to the sights I've launched off other pistols (Hungarian Hi-Power and a Colt Gold Cup) and take it as a sign that Fate intended me to have that gold bead or glow in the dark insert I've been thinking of and not bother Tisas with a warranty request, but I do remember how miffed I was when the rear sight on my fancy Gold Cup went missing.