No, believe it or not, KVBC's signal has never been a problem before.
I guess I should have mentioned this before, but I ran into some heavy weather about 75-100 miles from Vegas. I don't know if the storms were in the Vegas metro area - storms in the desert are unpredictable and suddenly appear and disappear - but I'm not assuming that was the problem either. I just thought if someone on this board lives there and had the same problems, that they might have some insight. Believe me, I'm not losing any sleep over this mystery.
KVBC owns the Laughlin translator, K40CQ, so I'd be surprised if they were relying on OTA reception, but it's my understanding that when the primary station goes down, the translators are supposed to go silent as well.