version 64.0.3265.0 (officail build) canary (32 bit)
Platform10128.0.0（official build) canary-channel kevin 
Firmware Google_kevin.8785.220.0

REPRO STEPS:
1. Log on Kevin chrome device 
2. Do some operation or do nothing 
3. Wait for a while

Actual:
Chrome device will auto quit to system,
Sometimes quit to < verification is off> page
Sometimes quit to log on page 

Note:
Repro more times today