So I think my device does have a radio issue...
Was told by the store manager that I could come in and get my device replaced during tonights midnight release and they'd hold one for me. I went in I would say within 15 minutes of talking to her on the phone but she had already left. The current manager told me that there is no midnight sale and I would have to take my chances with any extra's that don't sell tomorrow.
I said I would be fine waiting until tomorrow and she changed her tone and said "Uh, oh, all our stock is currently being held for customers who asked us to hold one for them so we don't have anymore actually" so I think they just don't want to use one of their stock to replace my device.
I know my 4g is having issues because another employee had the same S3 phone and he was getting 11mbps while I was getting 1mbps in the store when we did a comparison test.