Same thing with my Sonata SE, heat related. Been in the 90's everyday for the past two weeks here in NOLA and when the car is left in the sun for more than 2 hours I get the same thing. 2011 Sonata SE Std. radio. If things don't improve by next week I'm taking it in because the GLS's have the same radio and I test drive those with customers every day with no problem.