zzzzllloooppppssssnnnnmmmm

Can you tell me why when I lead a pointer and my partner has an ace, he lets it go and invariably our opponent takes the trick? If a real life partner did that, he would only do it once after I read him the riot act. It happens very frequently! Ok, just happened again. This time, my king, and an opponents 10 laying, and my parter throws a queen while having an ace in his hand. This is ridiculous!