yeah, for mine, I had issues before, and tried all sorts of variations of back and forth, 12b, 24a, 4.2, 4.4, I was all over the place, and just ended up staying on whatever it was. And the signal steadied out, but I'm not sure why or how. I hadn't changed anything, and suddenly it started working again (was on a 12b load at that point). I know there were a couple places where I started picking up 4G where there wasn't before, so I assume a couple more towers got loaded up, but still, not sure why that would suddenly effect my other areas. But once it started working, I revisited a KK rom, and so far so good.
Of course, now there's that G3 thing...