Six foot double batten unit. One tube not working for about four months. Swapped the two starters over. Same tube still not working. Replaced that tube. Replacement (in the same position) not working. Gave up for a while.
Two weeks later - both tubes lit! Still OK after a couple of days. Why? What could possibly cause the thing to start working again? I don't know enough to even speculate. Can anyone suggest what might have happened?