I honestly think that every single GN has the issue...every one. BUT, if you live in a very strong 4G area, you'll wonder what people are talking about. However, take those same 'reliable' GNs to one of the areas that people are having trouble in, and watch as that 'reliable' phone becomes UNreliable.
As with real estate, it's location location location. But with that said, those areas are what separates the men from the boys. A phone with a great radio like the Rezound, will shrug these issues off and maintain a solid 4G connection while a phone like the GN will struggle.
Whether it's software or hardware, nobody knows. I'm convinced that anyone that is 'sure' this is a software problem has no idea what they're talking about. We can 'hope' it's software, but nobody at this point can be certain. What we can be certain of is that the GN has issues in areas where other 4G phones don't.