Just don't get one first thing in the morning. I've had these several times, first time was around 10:30am(mmmmmm, perfect

), second time, around 3pm(again, perfect), and lat time around 9:15am, it was lukewarm and felt like it could have been from the day before, very disappointing.
I read someone's trip report before I left for my last trip and they mentioned the same thing, but I thought it was just a fluke and got one anyway. I was kicking myself for not waiting.