Class AB amplifier becomes hotter, using more current and then becoming even hotter
It appears that you are using the B-E junctions of Q1 and Q3 to provide the bias for Q2 and Q4, respectively. This will only work if the four transistors are coupled thermally so that they are all at the same temperature.

Also, the value of 39 for RES1 and RES2 is ridiculously low. What are the operating voltages of this amplifier?

Overall, this is a very poor circuit. Where did you get it?