sporadically
UK: spəˈrædɪkli | US: spəˈrædɪkli
adv. occurring at irregular intervals or in scattered instances; not continuously or consistently
The word traces back to Greek sporas, reflecting the idea of seeds sown widely rather than in orderly rows. Over time, sporadikos entered Late Latin as sporadicus, later adopted into English as "sporadic" (adj.) in the 17th century. The adverb form sporadically emerged by adding -ally, emphasizing irregularity in action or occurrence.
The Wi-Fi signal works only sporadically in this area.
She attended classes sporadically, often skipping weeks at a time.
Reports of the rare bird sighting came sporadically from different regions.
His interest in the project waxed and waned sporadically.
The old clock chimes sporadically, sometimes missing hours entirely.