Id rule out that its heat or that its the app itself. Those dont add up here. Im sure motorola takes heat into account when building the phone, esp when this is an intended use. I mean you pull off a mod and it breaks it, seems pretty clean cut that it was the mod. I didnt say networking was the issue, more the network configuration. As in how they are set up to handle authentication. Alot of times when companies aquire other companies and their equipment they cant always have a "Standardized" setup, due to different hardware and software in use. Im thinking thats why were seeing the variations in how quickly the 3g drops. Im also thinking maybe the hot spot app has some other means of authentication or something to trip a red flag when you pull this lil reach around trick.