My 19 did about the same thing the other day. It was still under the one-year warranty. I sent it to Cobra with an explanation. They sent me a new one in return mail with no explanation. The new one works, so far.
I've had such "today she works, tomorrow she don't" problems with other brands too. I think it's the poor soldering, but who knows. Manufacturers expect you to throw them away and buy another one. It is the MO of the throw-away society we live in today. In my latest case, Cobra got caught because it broke within the warranty period. Only cost me $10 for shipping back to the factory. I guess that's a bargain.