An instance where one flaps.

A phonological process found in many dialects of English, especially American English and Canadian English, by which intervocalic /t/ and /d/ surface as the alveolar flap /ɾ/ before an unstressed syllable, so that words such as "metal" and "medal" are pronounced similarly or identically.

The situation where a resource, a network destination, etc., is advertised as being available and then unavailable (or available by different routes) in rapid succession.

That flaps or flap

“flapping sails”