After briefly dancing above a dollar, Sirius XM Radio (SIRI) is now struggling to maintain its Nasdaq qualification.  According to details surfacing Friday, Nasdaq officials have floated a warning letter to Sirius following a 30-day, sub-$1 position. 

That is the second notice in recent memory - the other coming last fall - though the skies have improved considerably since last year.  Sirius recently enjoyed a profitable quarter and subscriber gains. 

Sirius, no stranger to adversity, indicated that it will work with the exchange to preserve its listing. "We are committed to remaining listed on The Nasdaq Global Select Market," CEO Mel Karmazin said.  At the Friday bell, Sirius was trading at roughly $0.83.