This is likely a problem with the ice cream machine. The most probable culprit is that the freezing canister did not sufficiently freeze. Make sure to let it sit in a very cold freezer (at least 0ºF) for 24 hours. If your machine is a refrigerant model, there is likely an issue with the compressor. Some compressor models have an auto shut-off safety period after it’s been turned off, to help preserve the motor. Ensure this is not the problem.