so for the second time, my vortex has just completely shut off. no "power off" warning or anything. both times while i was using it while it was charging. after it shuts off, the search button on the bottom right hand corning begins to flash. nothing i do will seem to turn my phone back on. i took out the battery and everything. so i just left it plugged up. a few minutes later it turns back on and it works fine. just wondering what the problem could be and how i can stop it from happening again.