I am having a strange problem with the Sprint mobile hotspot. When I am in a 4G area, my phone picks up and uses 4G with no problem. However, the instant I turn on the mobile hotspot, the 4G connection drops, and the phone reverts to 3G. The moment I turn off the hotspot, the phone goes back to 4G. If I turn the hotspot on/off from the Wireless & networks settings page, I can see that the instant the hotspot finishes initializing, the 4G line goes to "disconnected." It then goes to scanning and then sits at "obtaining IP address" for several seconds, at which point it starts that cycle over again. It goes through this cycle repeatedly until I turn off the hotspot, never getting past the "obtaining IP address" stage. I called Sprint tech support, and the best they came up with was to do a hard reset and see if that resolved the issue. Before I do that, I would like to see if anyone here has any idea what might cause this issue and how to resolve it short of a hard reset. I am running the official OTA froyo OS version. The update was pushed out the day after I got my Evo, so I do not know if this issue existed in 2.1.