intermittency

/ˌɪntərˈmɪtənsi/
noun
  1. The quality or state of stopping and starting at irregular intervals; lack of steady continuity.
    • The intermittency of the internet connection made it hard to finish the video call.
    • The patient complained about the intermittency of her headaches, which came and went without warning.
    • Solar power's intermittency means it doesn't produce electricity when the sun isn't shining.