It has something to do with the way the BN software shuts off the Wifi when the screen turns off. The work-around for this is to install Settings Profile Life and set a profile to turn off Wifi when the screen turns off.
I have this happen when I use Pulse. Not sure why. I can read a book for hours and have no issues. I bring up Pulse for a while and it reboots after about 5 minutes.
