Every so often (2,8)

There are a few possibilities for this:

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2,8

3,3,2

4,2,1,5

off and on

(Other definitions for off and on that I've seen before include "Now and then, stop and start" , "Intermittently" , "Intermittent" , "switch positions" , "the two sides at the Oval are this" .)

I've seen this clue in the Sydney Morning Herald.

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