I was flying a Fokker 100 a few months back over central Europe. We had probably just reached cruising altitude when the cabin temperature suddenly skyrocketed without reason, with the air coming out probably around 30 degrees (Celsius). After complaints by fellow travellers it became cooler. Is there any reason why it would do this?
I guess the pilots might have done it, but I see no reason for it, so could the aircraft have done it on its own accord?