I done cracked my stone

This happened last night. Oven preheated to 500 degrees with the stone inside and then left for a few hours with the oven on. (I normally only give the stone an extra 30 minutes but something had come up)

I made two dough balls, #1 was cold proofed and left on the counter for a couple hours at room temp. #2 was also cold proofed but given less time at room temp before going in. There was a gap of about 10 minutes between the pizzas going in.

I’m wondering if my mistakes were:

1) Leaving the stone inside the oven too long at temp

2) Not setting dough ball #2 out long enough to get to room temp before putting it in the oven

or

3) Not leaving enough time for the oven to get back up to temp between baking each pizzas.

Maybe all of the above?

I’d really appreciate any advice. I’d like to avoid this happening again if I can help it.