The "Generation suspended" message means the generator is finishing producing a cycle of items, and the items it has generated are still being produced or need to be collected.

To resume production:
  1. Check the area around the generator.
  2. Collect all the items that have been produced.
  3. Once the space is clear, the generator will automatically resume its production cycle.
Simply wait a short time for the next item to appear, and you can continue with your game!