Aspire Plato question

I have another question about the Aspire Plato. I've had the plato for about a week. Twice this past week I was vaping and then noticed the display area was blank. I was using the fire button to vape but when I tried the fire button to lock the unit the button only fired the unit. The only way to get the unit to turn off and the display to return was to remove the battery and then replace the battery. The unit then "rebooted"/ turned on and Then the display showed and I pressed the fire button 5 times and the unit locked. Has anybody else had the display go blank and unable to then turn off.
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