Late 2013 rMBP HDMI crash

Hello there,

I recently bought a 15" Late 2013 Retina Macbook Pro and I've been having problems with the HDMI connection. When I connect it with the TV, sometimes crashes. Not immediately, but it crashes. All the screen turns grey, and then puum. crash. This happened three times in less than a week.

Also another question: when i'm playing, temperature rises to 99º degrees celsius, even with fans running at 6000 rpm's. Is it normal? I don't suppose it is...

Thank you all in advance!