Those cracks have been happening for a long time on the Phantom Frame. Those props most likely have nothing to do with those cracks.
If you research you will find those cracks go way back , and are a design flaw in the shell.
This is why we recommend that you do not purchase from DJI and purchase from a Department store.
This allows you to squeeze the hell out of the drone to test it, squeeze the motor arms, and the legs hard , if they crack or squeak take it back, this goes with the battery also.
There also was a really bad firmware a ways back that caused the drone to violently shake , many people posted the vids of that happening. So bad apples , they exist. Take it back .