Probably... (speculation follows)
They perhaps shaved structural margins a bit too much on the booster. The structure vs weight tradeoff is where a rocket engineer earns his paycheck, especially in the first stage.
Or perhaps the maneuvering was just too sporty and they need to tone it down. Perhaps you can't just flip a SuperHeavy booster as hard as a Falcon 9.
Maybe they turned up an issue in the flight termination system or guidance in the second stage. That could be hardware or software. Maybe the FTS overdid it instead of underdoing it like last flight.
They certainly fixed the pad issue, the issue with not all the first stage engines firing, the flight termination system, and the staging, so I'm sure they'll have some sort of solutions to what broke on this flight.
And then we'll see what breaks next! Wheee!
My money is on the heat shielding. You could see tiles coming off. Of course the Space Shuttle orbiter had the same problem and they lost a bunch of tiles too. Difference there was that the orbiter was manned, so it was a slight bit more critical.
The next one will probably make it to orbit, but we'll have to see how many separate pieces re-enter over Hawaii.
You can sure tell they're big fans of Kerbal Space Program.