Is anyone familiar with refrigerator ice machines?

Our ice machine is acting odd and has been for several months. Every once in awhile it will stop making ice. When it first happened we bought a bag of ice and put it in the tray the machine dispenses ice into. A few hours later, it started making ice again. A month or so later, it quit. We waited about a week and it started making ice again. Now it happens about once a month and won’t make ice for a week or so and it starts up again. We can hear the water going down into the ice machine but we get no ice. Any ideas would be appreciated!