One of the worse races so far this year.

Qual was just hilarious for me, as I couldn't get any better time, but just before the qual I got a PB and started getting good splits every lap, and I thought I would go into .34, but no.
1st race was ok, as I managed to get somehow from 17th to 12th.
2nd race was hell. Since I saw that everyone is using only R3's, I decided to do the same. The 1st race with R3's was successful. But for me the tires burn faster since I use keyboard, and every time I turn I basically warm up my tires. Because I can't turn smoothly, I have to press the turn button back an forth to go in the corner...But then, because I was waiting for the place the first 10 laps, I burned my tires a bit accidentally. But they weren't that hot, so I just cooled them down and kept going, but after overtaking one guy in the corner in lap 13, my tire just popped from nowhere. I was a bit shocked, since the tire was like 140 degrees max I think, and I didn't understand why did it blow up. Well and I only felt that something just happened but didn't know it was my tire, so in the next corner when I tried to brake and turn, my car just went straight in to the sand.

So then I had to leave the server, because there was nothing I could do anymore...
EDIT: I checked the replay, and it popped even before the turn, because I braked so hard, and I guess there was lots of pressure on it. I started braking late, and I had to avoid Cagaš so I pressed on my brakes so hard that it blew up.

Could someone explain why does the tire blow up, when it's not even that hot, or was it hot enough? I've seen peoples tire blow up, when they are ice cold, why does that happen? I've just never blew up my tire before in any cup, only maybe by doing it on purpose.