What is going on with the Mavs?

[SleepingHero]

"Basically, teams are hitting a ton of difficult shots against the Mavericks, and Second Spectrum’s tracking analysis says they’re doing so at abnormally high rates. The data company comes to this conclusion by analyzing shot type, shot distance and nearby opponents, and it compares those factors to hundreds of thousands of shots in its NBA database to find averages. (If you’re familiar with soccer analytics, its concept is similar to xG.)"

My question though is WHY. There is a reason why 4 teams have waltzed in and have nailed these difficult shots. Is it poor defensive effort? Who are nailing the shots? Big men? Guards? A mix? Is it our lack of size in lineups? Or is it actually just prayers that have for some reason gone in? A 6% increase is significant. If it was 1-2% higher, I can say "okay yeah the Mavs are just getting unlucky". But 6% is pointing to a more systemic issue to me. I don't think it's just random chance that teams have found it easy to score on the Mavs, even the tough ones. 

It's an easy cop-out by Cato to say, "Hey look its only 4 games and you can't use stats you normally use to draw conclusions due to a low sample size and also the Mavs are getting supremely unlucky where their opponents are just hitting tough shots!" 

So far the Mavs defensive effort besides the Clippers has been atrocious. And there are a lot of players to blame.