I'm on my 3rd and each had different issues, but none of them had the same issue, when I've used meticulous steps to test each one by introducing the same apps/elements at the same times. I can only conclude the phones are showing batch-specific defects. That's not a bad thing... manufacturers are plagued by batch-run issues all the time, but it's a shame it takes laypersons and normal joes like you and I to catch this crap, rather than LG doing so and making right.
It's not the kind of thing you can complain to VZ about either... they don't return phones under factory warrant because they randomly reboot all the time. I'm sure if you raise enough Hell in the store, you'll get a manager to warranty it, but it shouldn't take that kind of effort to get a 'bug free' phone, IMO.
That said, #3 is my best one yet... as long as I keep it underclocked and use BP, I rarely get reboots. It's a shame I have to underutilize the phone, but I'll put up with it til ICS is released. If the ICS release doesn't resolve these problems, I'm taking it back to VZ and going with a different phone (after 3, they give you an equal brand replacement).