Chemistry question. Why is ozone not stable and would it become less stable as the temp increases.?

" The standard free energy of formation of ozone is +163.4kj/mol. Write the chemical equation for the formation of ozone. Comment on the stability of ozone based on the data. As temperature increases, would you expect ozone to become more or less stable." I am fairly sure that i have the correct chemical equation( 1.5O2----->O3) and i know that ozone is not stable. For my reason i have that the product form is not desirable for oxygen because it wants to be diatomic O2 not O3. I have no clue, however if it would become more or less stable as temperature increases. That is what i need help with..... Please and thank you!