I have the same problem. A ThunderBolt, a MiFi 4510L, and a UML290. None of these things work well. The modems do not lock onto 4G, nor do they work well on 3G, they continually disconnect after no more than 3 minutes. I have called tech support and been into 4 different Verizon stores. In every case I am told that "they" have not heard of this or that problem before. The most comical was when two (2) clerks greeted me at a Verizon store and told me that they had never heard of a re-booting issue & their primary phones were ThunderBolts that they had also had since day one. After further inspection, we found that they had not upgraded the ThunderBolt in early May like many of us had. They still had the original factory delivered OS.
Through persistence and by reading many on-line forums, I've gotten all the instructions on selecting networks and factory resetting, etc. They do not work! I rely primarily on my much older 3G device, a MiFi 2200 that always connects whether or not the newer modems will or won't. If I hadn't kept the MiFi 2200 under contract I would seldom have Internet.
The T-Bolt constantly reboots without my desire. It has several factory-installed programs that do not work correctly and sometimes lock up or take-over the phone, requiring a reboot. The News app never updates and takes over the phone while doing nothing except preventing me from using the phone. The SMS app takes over the phone and often loses & doesn't send or receive messages. When the phone is in it's auto-cradle (the one Verizon sold me with the phone 2 months ago) Bluetooth doesn't work, but screen auto-rotation does work. When the phone is out of the cradle, Bluetooth does work, but screen auto-rotation doesn't. These are very expensive devices that do not do what Verizon told me they would do. I wish I could just cancel my contracts and get cheap devices from a cheap vendor instead of these expensive non-working devices from this very expensive vendor.
