About 2 weeks ago, my Revo started spontaneously rebooting (frequently!) when LTE/4G was enabled. Only way to stop the reboots was to scale back to "CDMA only" from the Wireless and Networks menus.
VZ acknowledged the issue, sent me another Revo that did the same thing. Support then did the right thing and switched me into a different phone. No iPhone, Maxx, or Nexus 2, but many others offered.
Chose the Spectrum (gave LG another chance, I guess), and love it!
YMMV, but good luck up those with reboot problems on 4g
Sent from my VS920 4G using DroidForums