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I am running Ubuntu 18.04.2 on an Acer Laptop (F5-573G-52PJ).

Randomly the system does a shutdown itself. In /var/log/syslog I see the events:

May 15 11:24:53 top boltd[1176]: power: got event for guard '2' (10)                               
May 15 11:24:53 top boltd[1176]: power: guard '2' for 'fwupd' deactivated                          
May 15 11:24:53 top boltd[1176]: power: shutdown scheduled (T-20,00s)                              
May 15 11:25:13 top boltd[1176]: power: setting force_power to OFF

In the second before, I started a Terminal. In other occasions I didn't. It also only happens if the laptop is running on batterypower. Has someone experieced similiar things? Thanks for your inputs and suggestions in advance.

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