I have the same situation. My new grippers, that I only rode 3 times so far and at parks everytime, are starting to have crack lines...? The park I spent the most time at is smooth, concrete bowls, nothing rough at all. I had 2 other pairs of grippers, my first pair lasted like 2 years, and my other pair was the last batch of full cores and theyre still out there going strong.
Idk why this pair is already cracking.. Hopefully it smooths out.