Sometimes it is a matter of luck.... Ask any senior GL150 bros here, everyone has their own fair share of good and lousy bonks, including yours truely.
There are varied reasons to the underperformance of the girl and it is a number's game. I count my blessings when there are more hit than misses over time. Just don't take it too personally when you meet a bad apple. Take it as a temporary bad investment for the day.
