PS3 80010006/ Red Light Error

So, i was going to the PS3 Store on monday to buy Black Ops 2. But when i got home, i put my disc. And then i turned on the PS3. But then, The red light popped up and it blinks 2 times, And then it just became red. I then remove the disc and put it back on. And then, There is the green light. I was happy that it became green and now i can play Black Ops 2. But at the end of the 3rd final mission, it disconnected. Later That same day. I wanted to play zombies. But Again, The Red Light. And then the next day, The green light pops up. And i can continue the story ( I changed my mind). But at the start of the 2nd final mission. The audio cut and the game freezes. And then its just the red light. I asked a tech to fix it. But he doesn't know what is the problem with the PS3.

And then I clcked the No Disc is connected to the USB Port Thing and it said "Error 80010006