Wow, I'm glad to hear I'm not alone in this issue, but I'm sad to see there's no clearcut answer.
I've had my Optimus V for almost a year. Last week I started noticing I had no signal and found this forum. I hadn't installed any apps recently, but I uninstalled the last few I've had for a few months and that didn't fix anything. I don't root my phone or whatever -- total novice when it comes to this stuff.
Here's my question. Will doing a factory reset on my phone fix this issue? I've been so, so happy with my phone up until now, even with the slooooow 3G when I'm at work in Chicago, but I'd rather know now than later if I just need to get a new phone.