Hello all. I was driving my C7 to work. I made a Left hand turn and the entire dashboard cut off for about 10 seconds. Everything came back on. I was driving it again a few weeks later the same issue. Took it to the dealer and they could not replicate the problem. That same day I tried to make a call and the OnStar system just made a hissing sound, I called OnStar (on my cell) they said to shut off the car for 10 mins and it would reset. It did. Anyone else having these issues?