Phoenix, actually mostly just Booker, was making tough shots the first three quarters, so I am not surprised they cooled off a bit in the 4th. It is hard for even NBA players to keep up that level of shooting against a very good defense. I think this is one of those games where a team went to their star a little too much rather than work everyone else into the offense. Cam Johnson in particular needs to get the ball more.
The Bucks continue to have too many dumb possessions, and this will be the reason they lose if they don't win 2 of the next 3. There are too many shot-clock killing isolations by Middleton, Holiday and Antetekuonmpo. Middleton and Antetekuonmpo score on a few of these which make them seem more effective than they really are. Wasting 10-12 possessions a game can be the difference between winning an losing. Booker's stupid 5th foul which sent him to the bench for 6 minutes bailed the Bucks out last night, but they have to play smarter.
The Bucks also need to play Lopez more and keep him closer to the basket. If the Bucks want more space for Giannis to operate then they need to keep Lopez on the baseline or block, and then flashing to the weakside on Giannis' drives. Forbes getting a DNP was puzzling in a game where the Bucks were struggling from outside.