[tjrob]

I have also seen MobileSheets suddenly exiting on my Chromebook. It happens randomly, usually after hours of usage. Restarting MS exits immediately. Power Cycling the Chromebook then lets me open MS and use it, until next time. MS 3.8.6 (just updated to 3.8.9).

I have never seen the Chromebook go to sleep on its own.

This is an HP Chromebook x360 2-in-1, with a USB pedal.