This sounds like almost every game I've played since 1995 (well, perhaps worse).
Dice are the more fickle than women I find. At least you can make women happy with flowers and jewelry, dice don't like anything. Every since the great Wood Elf Lord vs. Chaos Knight debacle of 1995, my dice rolling has been abysmal. The only thing I find that works is purchasing new dice. I usually do this before every tournament, its become a superstitious ritual for me. I've heard of others that will go through extreme lengths for "dice re-education" where they will set up all their dice so they can see and then smash/melt/grind/ritually destroy a random die in order to get the other dice back into line and fearing to roll bad.