I am having the same issue with both my mifi 4g and Thunderbolt (hotspot):
- I am able to connect to the 4g network and everything works fine (speeds are quite impressive)
- After ~ 30 minutes of use I am not longer able to browse the web and/or ftp files
- ping and DNS resolution continues to work
- a soft reset corrects the problem
I have been able to duplicate this same issues in San Jose, Phoenix and LA.
To date, Verizon customer service has been of no help. As such, I have filmed and uploaded to youtube a video of my expierence: http://www.youtube.com/watch?v=-AQMMK87N2g
Perhpas someone can help?
Thanks
JSZ