Fitful, Erratic
This page is the CodyCross answer for the clue below from Health and Fitness, Group 2125, Puzzle 4 (Headphones).
Question is: Fitful, Erratic
and the answer is: SPASMODIC
Word Meaning:
SPASMODIC — Of or relating to a spasm; resembling a sudden contraction of the muscles.
Definitions from Wiktionary.