It could be because the laptop lost power and all program state saved on RAM became lost due to power outage. You mentioned after 'close the lid for the night', '90% of the time it shut down'.
Not affected by power loss.Ĭould it be because the battery could not hold charge or battery controller circuit is not stable. Sleep => program state is saved in RAM (all lost when power out), Hibernation => program state is saved in HDD. Note: For your case, I assume that you mean 'sleep' as in 'standby/suspend to ram' (S3), not 'save program state in HDD' as in 'Hibernation mode' (S4), based on ACPI spec: I believe it could be a few possibilities which I would try to list as below:
