This condition usually requires the attention of a clockmaker for a permanent fix. Clocks stops within a few minutes. Clock is probably out of beat. This is best corrected by a clockmaker. See if the pendulum is rubbing against the back of the case, and if so reposition the case so the back board is vertical or leans forward slightly.
Clock stops at apparently random times.
Check to see if the clock is wound properly. Check the hands to see if they contact each other or the dial or the glass. Move the hands slightly if so, but bend them very gently and only a small amount. Check to see if the case may be shifting position when touched, or because of nearby road or foot traffic vibrating the floor. If so, the case must be fastened securely to the wall behind it.