Crossword puzzle clue "so then what"

Hybrid car that runs a few seconds, then stops, then runs again, then stops again...?

Do this, then that, then this again

Place whose population was 1, then 2, then 0

Back then, back then

"First I'll read, then watch the movie, then..."

Entering your middle name, then date of birth, then adding a "1," etc.?

Brown, then red, then brown again, maybe

HP tablet released in July 2011, then discontinued six weeks later (then revived later in the year!)