Okay, just an update on this: I used the LG Modbile updater, and updated the phone.
Upon rebooting after update I still had the WiFi issue with no root on the phone, so I decided to re-root, and see if that would solve it - it didn't.
I also tried switching my routers out again both while rooted, and not; and that's done nothing either.
So I'm concluding that short of buying another router (which I HIGHLY doubt it's an issue with what brand makes them) the best thing I can think of is that the phones firmware or hardware is just buggy.
I just bought this phone yesterday, and it's kind of sad to think that I may have to return it after I got everything set up on it.
IF I decide to return, and replace, I will update with the new one, and whether it has this issue.