Acer has become aware that the Chromebox CXI5 model may not power back on automatically after running Chrome OS updates. This is caused by a Google H1 firmware security update.
Once the automatic update is finished, you will need to manually press the power button to power the system back on.
Google plans to fix this issue in FW v14505.410.0. This update will be released via Chrome OS auto update on Chrome OS 115 (target: June 2023).