Our group, who play it a Lot, were at the point where people were doing totally outrageous things in the endgame, like 4 of 5 players trying to have a bid be made so that a player at 196 points didn't get a 5 point bonus for the bid being missed and thus won. I was at the point of being almost unwilling to play Mu with this group of people any more so tried to come up with a few solutions to the endgame. Unfortunately people want to win so this wasn't going to be acceptable to some. Better, but there is still an endgame problem, just a bit different. This is what we went with and it has been a BIG improvement for us.
People now pay much less attention to the score and just play.
The idea was stolen from a bunch of other games like Lowenherz and details of how we currently play are below. Note that game length and randomness level can easily be adjusted by just changing the numbers and die-rolling pattern. Up until someone gets 150 points, you just play normally. As of the point someone gets 150 points, at the end of each hand the next dealer rolls a die. In the first round, if a 6 is rolled the game ends immediately.