Definition
When a machine or other object seems to behave or move in a way that is not controlled by the person using it, it is said to have a mind of its own.
This old car seems to have a mind of its own; sometimes it just won't start.
I tried to close this app, but it seems to have a mind of its own and keeps reopening.
This printer seems to have a mind of its own; it refuses to print anything today.