I'm unable to browse the web on my stock NC tethered to an EVO Sprint 4G. 3G works fine. Issue exists with stock EVO and Sprint Hotspot with 4G radio, and also with rooted EVO and tether on the 4G radio. Barnes and Noble Tech Support simply say 4G isn't supported. Any ideas? 3G's fine. I've tried 2 Nooks, both same problem.